{"id":890,"date":"2019-08-02T12:56:00","date_gmt":"2019-08-02T12:56:00","guid":{"rendered":"https:\/\/analystprep.com\/study-notes\/?p=890"},"modified":"2026-03-03T05:33:44","modified_gmt":"2026-03-03T05:33:44","slug":"putting-var-to-work","status":"publish","type":"post","link":"https:\/\/analystprep.com\/study-notes\/frm\/part-1\/valuation-and-risk-management\/putting-var-to-work\/","title":{"rendered":"Calculating and Applying VaR"},"content":{"rendered":"<p><script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"ImageObject\",\r\n  \"@id\": \"https:\/\/analystprep.com\/study-notes\/images\/putting-var-to-work-img11\",\r\n  \"contentUrl\": \"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img11.jpg\",\r\n  \"url\": \"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img11.jpg\",\r\n  \"caption\": \"Putting VaR to Work \u2014 VaR Example (Image 11)\",\r\n  \"width\": 1000,\r\n  \"height\": 894,\r\n  \"copyrightNotice\": \"\u00a9 2024 AnalystPrep\",\r\n  \"acquireLicensePage\": \"https:\/\/analystprep.com\/license-info\",\r\n  \"creditText\": \"AnalystPrep Design Team\",\r\n  \"creator\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"AnalystPrep\"\r\n  },\r\n  \"isPartOf\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/analystprep.com\/study-notes\/frm\/part-1\/valuation-and-risk-management\/putting-var-to-work\/\"\r\n  }\r\n}\r\n<\/script> <script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"ImageObject\",\r\n  \"@id\": \"https:\/\/analystprep.com\/study-notes\/images\/putting-var-to-work-img21\",\r\n  \"contentUrl\": \"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img21.jpg\",\r\n  \"url\": \"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img21.jpg\",\r\n  \"caption\": \"Putting VaR to Work \u2014 VaR Example (Image 21)\",\r\n  \"width\": 1024,\r\n  \"height\": 906,\r\n  \"copyrightNotice\": \"\u00a9 2024 AnalystPrep\",\r\n  \"acquireLicensePage\": \"https:\/\/analystprep.com\/license-info\",\r\n  \"creditText\": \"AnalystPrep Design Team\",\r\n  \"creator\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"AnalystPrep\"\r\n  },\r\n  \"isPartOf\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/analystprep.com\/study-notes\/frm\/part-1\/valuation-and-risk-management\/putting-var-to-work\/\"\r\n  }\r\n}\r\n<\/script> <script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"ImageObject\",\r\n  \"@id\": \"https:\/\/analystprep.com\/study-notes\/images\/putting-var-to-work-page15\",\r\n  \"contentUrl\": \"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-600x474.jpg\",\r\n  \"url\": \"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-600x474.jpg\",\r\n  \"caption\": \"Putting VaR to Work \u2014 Page 15 Example\",\r\n  \"width\": 600,\r\n  \"height\": 474,\r\n  \"copyrightNotice\": \"\u00a9 2024 AnalystPrep\",\r\n  \"acquireLicensePage\": \"https:\/\/analystprep.com\/license-info\",\r\n  \"creditText\": \"AnalystPrep Design Team\",\r\n  \"creator\": {\r\n    \"@type\": \"Organization\",\r\n    \"name\": \"AnalystPrep\"\r\n  },\r\n  \"isPartOf\": {\r\n    \"@type\": \"WebPage\",\r\n    \"@id\": \"https:\/\/analystprep.com\/study-notes\/frm\/part-1\/valuation-and-risk-management\/putting-var-to-work\/\"\r\n  }\r\n}\r\n<\/script> <script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"QAPage\",\r\n  \"mainEntity\": {\r\n    \"@type\": \"Question\",\r\n    \"name\": \"What is the 99% VaR for the Nikkei futures position using historical simulation?\",\r\n    \"text\": \"A risk manager wishes to calculate the VaR for a Nikkei futures contract using the historical simulation approach. The current price of the contract is 955, and the multiplier is 250. For the last 300 days, returns have been recorded. What is the VaR of the position at 99% using the historical simulation methodology?\",\r\n    \"answerCount\": 1,\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"Using historical simulation at the 99% confidence level with 300 observations, the VaR corresponds to the third-worst return because (1 \u2212 0.99) \u00d7 300 = 3. The third-worst return is \u22126.2%, so VaR = 6.2% \u00d7 955 \u00d7 250 = 14,802.50 (approximately $14,803).\",\r\n      \"dateCreated\": \"2026-01-20\"\r\n    }\r\n  }\r\n}\r\n<\/script> <script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"QAPage\",\r\n  \"mainEntity\": {\r\n    \"@type\": \"Question\",\r\n    \"name\": \"Which bank will estimate a higher 1-day 99% VaR for an at-the-money call: linear approximation or Monte Carlo full revaluation?\",\r\n    \"text\": \"Bank X and Bank Y are two competing investment banks calculating the 1-day 99% VaR for an at-the-money call on a non-dividend-paying stock. Bank X uses the linear approximation method, while Bank Y uses a Monte Carlo simulation method for full revaluation. Which bank will estimate a higher value for the 1-day 99% VaR?\",\r\n    \"answerCount\": 1,\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"Bank X (linear approximation) will estimate the higher 1-day 99% VaR. Because an option\u2019s value is convex in the underlying price, a linear (delta-based) approximation tends to underestimate option value changes for large moves, which results in a larger estimated loss (VaR) compared with a full revaluation approach such as Monte Carlo.\",\r\n      \"dateCreated\": \"2026-01-20\"\r\n    }\r\n  }\r\n}\r\n<\/script><\/p>\r\n<p><iframe loading=\"lazy\" src=\"\/\/www.youtube.com\/embed\/yDoaVoLsMNk\" width=\"611\" height=\"343\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\r\n<p><strong>After completing this reading, you should be able to:<\/strong><\/p>\r\n<ul>\r\n\t<li>Explain and give examples of linear and non-linear portfolios.<\/li>\r\n\t<li>Describe and explain the historical simulation approach for computing VaR and ES.<\/li>\r\n\t<li>Describe the delta-normal approach and use it to calculate VaR for non-linear derivatives.<\/li>\r\n\t<li>Describe and calculate VaR for linear derivatives.<\/li>\r\n\t<li>Describe the limitations of the delta-normal method.<\/li>\r\n\t<li>Explain the Monte Carlo simulation method for computing VaR and ES and identify its strengths and weaknesses.<\/li>\r\n\t<li>Describe the implications of correlation breakdown for a VaR or ES analysis.<\/li>\r\n\t<li>Describe worst-case scenario analysis and compare it to VaR.<\/li>\r\n<\/ul>\r\n<div style=\"background: #f3f4f6; padding: 16px 14px; border-radius: 12px; margin: 20px 0; text-align: center;\"><a style=\"display: inline-flex; align-items: center; justify-content: center; padding: 12px 18px; border: 2px solid #1d4ed8; border-radius: 999px; color: #1d4ed8; text-decoration: none; font-weight: 600; font-size: 16px; line-height: 1; background: #ffffff; white-space: nowrap;\" href=\"https:\/\/analystprep.com\/free-trial\/\" target=\"_blank\" rel=\"noopener noreferrer\"> Strengthen your linear and nonlinear portfolio risk analysis with a free FRM trial <\/a><\/div>\r\n<h2>Linear and Nonlinear Portfolios<\/h2>\r\n<p>A linear portfolio linearly depends on the changes in the values of its corresponding variables (risk factors). For instance, consider a portfolio consisting of 100 shares, each valued at USD 100. The change in portfolio value \\(\\left(\\Delta{\\text{P}}\\right)\\) is attributed to the change in stock (share price) which can be denoted by \\(\\Delta{\\text{S}}\\), and therefore the change in portfolio value is given by :<\/p>\r\n<p>$$ \\Delta{\\text{P}}=100\\Delta{\\text{S}} $$<\/p>\r\n<p>The value of the portfolio is USD 10,000 (=100\u00d7100). Now, if we introduce the effect of the interest rate, the change in the value of the portfolio will be given by:<\/p>\r\n<p>$$ \\Delta{\\text{P}}=100\\Delta{\\text{r}} $$<\/p>\r\n<p>Generally, consider a portfolio consisting of long and short positions in stocks. The change in a linear portfolio is given by:<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\sum _{ \\text{i} }^{}{ { \\text{n} }_{ \\text{i} } } \\Delta{\\text{S}}_{\\text{i}} $$<\/p>\r\n<p>Where:<\/p>\r\n<p>\\({\\text{n}}_{\\text{i}}\\) = Number of shares of stock i in the portfolio;<\/p>\r\n<p>\\({\\text{S}}_{\\text{i}}\\) = The price of stock i.<\/p>\r\n<p>Intuitively, the amount invested in stock i is \\({\\text{n}}_{\\text{i}}\\)\\({\\text{S}}_{\\text{i}}\\), and the price change is \\(\\Delta{\\text{S}}_{\\text{i}}\\).<\/p>\r\n<p>Now, if we multiply the above equation by \\(\\cfrac{{\\text{S}}_{\\text{i}}}{{\\text{S}}_{\\text{i}}} \\) , we have:<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\sum _{ \\text{i} }^{}{ { \\text{n} }_{ \\text{i} } } \\Delta{\\text{S}}_{\\text{i}}\\times\\cfrac{{\\text{S}}_{\\text{i}}}{{\\text{S}}_{\\text{i}}}=\\sum _{ \\text{i} }^{}{ { \\text{n} }_{ \\text{i} } } \\Delta{\\text{S}}_{\\text{i}}\\cfrac{\\Delta{\\text{S}}_{\\text{i}}}{{\\text{S}}_{\\text{i}}} $$<\/p>\r\n<p>Let \\({\\text{q}}_{\\text{i}}={\\text{n}}_{\\text{i}} {\\text{S}}_{\\text{i}} \\) and \\( \\Delta{\\text{r}}_{\\text{i}}=\\cfrac{\\Delta{\\text{S}}_{\\text{i}}}{{\\text{S}}_{\\text{i}}} \\) , then<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\sum _{ \\text{i} }^{}{ { \\text{q} }_{ \\text{i} } } \\Delta{\\text{r}}_{\\text{i}} $$<\/p>\r\n<p>Note that \\({\\text{q}}_{\\text{i}}\\) is the amount invested in stock i, and \\(\\Delta{\\text{r}}_{\\text{i}}\\)=\\(\\frac{\\Delta{\\text{S}}_{\\text{i}}}{{\\text{S}}_{\\text{i}}} \\) is the return on stock i.<\/p>\r\n<p>Therefore, we can say the portfolio change is a linear function of change in stock price or change in stock returns.<\/p>\r\n<p>Nonlinear portfolios contain complex securities that are not linear. For instance, consider a portfolio made of call options. The payoff from the call option is nonlinear because the payoff is zero if the stock price is less than the strike price at maturity and S-K if the stock price is higher than the strike price K.<\/p>\r\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"894\" class=\"aligncenter size-full wp-image-9090\" style=\"max-width: 100%;\" src=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img11.jpg\" alt=\"Call Option Payoff\" srcset=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img11.jpg 1000w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img11-300x268.jpg 300w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img11-768x687.jpg 768w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img11-400x358.jpg 400w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/>Note, however, that a forward contract is an example of a derivative whose value is a linear function of the asset because even if the contracts do give a payoff, the holder is obligated to buy the asset at a future time T at agreed price K. As such, in case the asset provides no income, then the forward contract&#8217;s value is given by:<\/p>\r\n<p>$$ {\\text{S}}-{\\text{PV}}\\left(\\text{K}\\right) $$<\/p>\r\n<p>Where S is the current asset price, and \\({\\text{PV}}\\left(\\text{K}\\right)\\) denote the present value of the future price K.<\/p>\r\n<p>The figure below shows the relationship between the value of a forward contract and the underlying asset.<\/p>\r\n<h3><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"906\" class=\"aligncenter size-full wp-image-9091\" style=\"max-width: 100%;\" src=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img21.jpg\" alt=\"Value of a Forward Contract\" srcset=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img21.jpg 1024w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img21-300x265.jpg 300w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img21-768x680.jpg 768w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/Calculating-and-Applying-VaR_img21-400x354.jpg 400w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/h3>\r\n<p>From the figure above, it is correct to say that a person who agrees to buy an asset at a future time is actually in a position to own the asset today but pay for it at a future time. \u00a0Now, the value of owning the asset today is S, and the present value of what will be paid for the asset at the future time is PV(K). This proves the formula above for the value of the forward contract.<\/p>\r\n<h2>VaR for Linear Derivatives<\/h2>\r\n<p>In general terms, the VaR of a linear derivative can be expressed as:<\/p>\r\n<p>$$ \\text{VaR}_{\\text{linear derivative}}=\\Delta\\times{\\text{VaR}}_{\\text{Underlying factor}} $$<\/p>\r\n<p>Where \\({ \\Delta }\\) represents the sensitivity of the derivative&#8217;s price to the price of the underlying asset. It is usually expressed as a percentage.<\/p>\r\n<h4>Example: VaR for Linear Derivatives<\/h4>\r\n<p>Suppose the permitted lot size of S&amp;P 500 futures contracts is 300 and multiples thereof, what is the VaR of an S&amp;P 500 futures contract?<\/p>\r\n<p>$$ \\text{VaR}_{\\text{S&amp;P500futures c.}}=300\\times{\\text{VaR}}_{\\text{S&amp;P500 index}} $$<\/p>\r\n<h2>Calculating VaR and Expected Shortfall Using Historical Simulation<\/h2>\r\n<p>Historical simulation is used to calculate one-day VaR and ES. However, for longer periods T it is assumed that,<\/p>\r\n<p>$$ \\begin{align*} \\text{VaR}\\left({ \\text{T} },{ \\text{X} }\\right)&amp;=\\sqrt{ \\text{T} }\\times \\text{VaR}\\left(1,{ \\text{X} }\\right) \\\\ \\text{ES}\\left({ \\text{T} },{ \\text{X} }\\right)&amp;=\\sqrt{ \\text{T} }\\times \\text{ES}\\left(1,{ \\text{X} }\\right) \\end{align*} $$<\/p>\r\n<p>\\(\\text{VaR}\\left({ \\text{T} },{ \\text{X} }\\right)\\) = Value at risk for a time horizon of T days and confidence level X.<\/p>\r\n<p>\\(\\text{ES}\\left({ \\text{T} },{ \\text{X} }\\right)\\) = Expected shortfall for a time horizon of T days and confidence level X.<\/p>\r\n<p>The above estimates assume that the portfolios&#8217; changes are normally distributed with a mean of zero and independent of each other.<\/p>\r\n<p>The historical simulation procedure involves the following steps:<\/p>\r\n<ol style=\"list-style-type: lower-roman;\">\r\n\t<li>Identifying market variables or risk factors -The first step involves identifying market variables (risk factors) on which the portfolio value depends. Examples of such variables include commodity prices, equity prices, and volatilities.<\/li>\r\n\t<li>Collecting data on the behavior of risk factors &#8211; Once risk factors have been identified, the data on the behaviour of these risk factors in the past is collected. In this section, we assume that the past period is one from the immediate past.<\/li>\r\n\t<li>Creating scenarios &#8211; After past data has been collected, scenarios are built by assuming that each risk factor&#8217;s change over the next day corresponds to a change observed during one of the past days.<\/li>\r\n<\/ol>\r\n<p>Risk factors are broadly classified into:<\/p>\r\n<ol type=\"i\">\r\n\t<li>Those whose past percentage change is to define the future percentage, for example, stock prices and exchange rates.<\/li>\r\n\t<li>Those whose past actual change is used to define an actual change in the future, for example, interest rates and credit spreads.<\/li>\r\n<\/ol>\r\n<h4>Example: Illustration of Historical Simulation<\/h4>\r\n<p>A portfolio is assumed to depend on many risk factors. For clarity, let us assume that three risk factors (exchange rates, interest rates, and stock price) over the past 300 days (longer periods such as 500 days are usually considered.) The most recent 301 days of historical data is as follows:<\/p>\r\n<p>$$ \\begin{array}{c|c|c|c|c} \\textbf{Day} &amp; {\\textbf{Stock Price} \\\\ \\textbf{(USD)} } &amp; {\\textbf{Exchange} \\\\ \\textbf{rates} \\\\ \\textbf{(USD\/CAD)} } &amp; {\\textbf{Interest} \\\\ \\textbf{rate (%)} } &amp; {\\textbf{Portfolio} \\\\ \\textbf{Value} \\\\ \\textbf{(USD} \\\\ \\textbf{millions)}} \\\\ \\hline {0} &amp; {30} &amp; {1.3901} &amp; {3.51} &amp; {60.0} \\\\ \\hline {1} &amp; {34} &amp; {1.4000} &amp; {2.64} &amp; {62.5} \\\\ \\hline {2} &amp; {40} &amp; {1.3921} &amp; {2.52} &amp; {61.25} \\\\ \\hline {..} &amp; {..} &amp; {..} &amp; {..} &amp; {..} \\\\ \\hline {298} &amp; {42} &amp; {1.3876} &amp; {2.40} &amp; {65.0} \\\\ \\hline {299} &amp; {40} &amp; {1.3910} &amp; {2.45} &amp; {60.25} \\\\ \\hline {300} &amp; {60} &amp; {1.4021} &amp; {2.50} &amp; \\textbf{71.25} \\end{array} $$<\/p>\r\n<p>Assuming that today is the 300<sup>th<\/sup> day, we need to know what will happen between today and tomorrow (301<sup>st<\/sup> day). To achieve this, we use the above data to create 300 scenarios (that is why we have 301-day historical data).<\/p>\r\n<p>In the first scenario, we will assume that the risk factors behave between the days 300 and 301 in a similar manner as they did between days 0 and 1. For instance, in the first scenario, the stock price increased by \\(13\\% \\left(=\\frac{34}{30}-1\\right)\\), and therefore the stock price on day 301 is USD 68 \\( \\left[=\\left(\\frac{34}{30}-1\\right)\\times60\\right] \\). For the exchange rate, it increased by 0.7% \\(\\left(=\\frac{1.400}{1.3901}-1\\right)\\), and thus, we expect the exchange rate for the 301<sup>st<\/sup> day to be 1.4121 \\( \\left(=1.4021\\left[\\frac{1.400}{1.3901}-1\\right]\\right) \\). For the interest rate, it decreased by 0.87% (2.64%-3.51%) and thus 301<sup>st<\/sup> interest rate is 1.63% (2.50%-0.87%).<\/p>\r\n<p>The calculation of the values of the second and subsequent scenarios&#8217; risk factors is similar to the first scenario calculation. For the second scenario, assume that the risk factors behave in a similar manner as they did between days 1 and 2. This will create the following table.<\/p>\r\n<p>$$ \\begin{array}{c|c|c|c|c|c} \\textbf{Scenario} &amp; {\\textbf{Stock Price} \\\\ \\textbf{(USD)} } &amp; {\\textbf{Exchange} \\\\ \\textbf{rates} \\\\ \\textbf{(USD\/CAD)} } &amp; {\\textbf{Interest} \\\\ \\textbf{rate (%)} } &amp; {\\textbf{Portfolio} \\\\ \\textbf{Value} \\\\ \\textbf{(USD} \\\\ \\textbf{millions)}} &amp; \\textbf{Loss} \\\\ \\hline {1} &amp; {68} &amp; {1.4121} &amp; {3.37} &amp; {70.25} &amp; {1.0} \\\\ \\hline {2} &amp; {71} &amp; {1.3922} &amp; {2.38} &amp; {72.15} &amp; {0.9} \\\\ \\hline {..} &amp; {..} &amp; {..} &amp; {..} &amp; {..} \\\\ \\hline {299} &amp; {57.14} &amp; {1.3910} &amp; {2.55} &amp; {71.25} &amp; {0} \\\\ \\hline {300} &amp; {90} &amp; {1.4021} &amp; {2.55} &amp; {73.25} &amp; {2.0} \\end{array} $$<\/p>\r\n<p>The risk factor values for the scenario table are directly calculated from the historical data table. The scenario portfolio values are generated based on the risk factors. We assume that the current portfolio value is USD 71.25 million (300th day&#8217;s value). After generating the portfolio values, we calculate the losses while attaching a negative to create a loss distribution.<\/p>\r\n<p>Assume that the first scenario&#8217;s portfolio value is 70.25, 72.15 for the second scenario, and so on. Therefore, the loss for the first portfolio is 1.00 (=71.25-70.25), and the second scenario is 0.9 (71.25-72.15), and so on.<\/p>\r\n<p>In order to calculate the VaR and the expected shortfall, we ought to arrange the scenario losses from the largest to the smallest. Assume that in our example, we wish to calculate one day VaR and ES at a 99% confidence interval. The sorted losses are as follows:<\/p>\r\n<p>$$ \\begin{array}{c|c} \\textbf{Scenario} &amp; \\textbf{Loss} \\\\ \\hline {200} &amp; {3.9} \\\\ \\hline {10} &amp; {3.0} \\\\ \\hline {25} &amp; {2.5} \\\\ \\hline {100} &amp; {2.0} \\\\ \\hline {&#8230;} &amp; {&#8230;} \\\\ \\hline {&#8230;} &amp; {&#8230;} \\end{array} $$<\/p>\r\n<p>In this case, VaR is equivalent to third-worst loss since the third-worst loss is the first percentile point of the distribution, i.e., \\(\\cfrac{3}{100}=0.01\\). Therefore, VaR=2.5 million.<\/p>\r\n<p>By definition, the expected shortfall is calculated as the average of the losses that are worse than the VaR. In this case,<\/p>\r\n<p>$$ \\text{ES}=\\cfrac{1}{2}\\left(3.9+3.0\\right)=3.45 \\text{ million } $$<\/p>\r\n<h4>Example: Calculating VaR Using the Historical Simulation Method<\/h4>\r\n<p>The following are hypothetical ten worst returns for an asset B from 120 days of data for 6 months. Find the 1-day 5% VaR and the ES for B.<\/p>\r\n<p>-3.45%, -14.12%, -15.72%, -10.92%, -5.50%, -3.56%, -6.90%, -2.50%, -5.30%, -4.31%.<\/p>\r\n<h4>Solution<\/h4>\r\n<p>First, we rearrange starting with the worst day, to the least bad day, as shown below:<\/p>\r\n<p>-15.72%, -14.12%, -10.92%, -6.90%, -5.50%, -5.30%, -4.31%, -3.56%, -3.45%, -2.50%.<\/p>\r\n<p>The VaR corresponds to the \\((5\\%\\times120)\\)=6<sup>th<\/sup> worst day = -5.30%. However, recall that VaR need not be represented as a negative.<\/p>\r\n<p>This implies that there is a 95% probability of getting at most 5.3% loss.<\/p>\r\n<p>The expected shortfall (ES) is calculated as the average of the losses that are worse than the VaR. In this case,<\/p>\r\n<p>$$ \\text{ES}=\\cfrac{\\left(15.72\\%+14.12\\%+10.92\\%+6.90\\%+5.50\\%\\right)}{5}=10.63\\% $$<\/p>\r\n<h4>Valuing portfolios<\/h4>\r\n<p>\u00a0Before we look at the delta-normal model, we will biefly look at the full revaluation approach. Under this approach the VaR of a portfolio is established by fully repricing the portfolio under a set of scenarios over a period of time.<\/p>\r\n<p>However, a full revaluation of a portfolio for many scenarios is a time-consuming activity. One approach to address this challenge is to use Greek letters. The Greek letters are the hedging parameters used by analysts to quantify and manage risks.<\/p>\r\n<p>One of the crucial Greek letter deltas \\(({\\delta})\\) is defined as:<\/p>\r\n<p>$$ {\\delta}=\\cfrac{\\Delta{\\text{P}}}{\\Delta{\\text{S}}} $$<\/p>\r\n<p>Where \\(\\Delta{\\text{S}}\\) is a small change in risk factors such as stock price and \\(\\Delta {\\text P}\\) the corresponding change in the portfolio value. Therefore, delta can be defined as a change of the portfolio value with respect to the change in the risk factor.<\/p>\r\n<p>For instance, consider stock price as a risk factor. If the delta of a portfolio with respect to the stock price is USD 100, it implies that the portfolio value changes by USD 100 if the stock price changes by 1 USD.<\/p>\r\n<p>From the delta formula, we express the change in the portfolio value as :<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\delta{\\Delta{\\text{S}}} $$<\/p>\r\n<p>Generally, if we have multiple risk factors, we find each risk factor&#8217;s effect and sum it up. That is, if we have <em>i<\/em> risk factors, then change in the portfolio would be:<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\sum _{ \\text{i} }^{}{ { \\delta }_{ \\text{i} } } \\Delta{\\text{S}}_{\\text{i}} $$<\/p>\r\n<p>However, the delta concept gives relatively accurate estimates in linear portfolios as compared to nonlinear portfolios.<\/p>\r\n<p>The accuracy of nonlinear portfolios can be enhanced by including another Greek letter gamma \\((\\gamma)\\) so that the delta-gamma formula is given by:<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\delta{\\Delta{\\text{S}}}+\\cfrac{1}{2} {\\gamma} \\left(\\Delta{\\text{S}}\\right)^{2} $$<\/p>\r\n<p>In case of multiple risk factors, the above equation changes to:<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\sum _{ \\text{i} }^{}{ { \\delta }_{ \\text{i} } } \\Delta{\\text{S}}_{\\text{i}}+\\cfrac{1}{2}\\sum _{ \\text{i} }^{}{ { \\gamma }_{ \\text{i} } }\\left(\\Delta{\\text{S}}_{\\text{i}}\\right)^{2}$$<\/p>\r\n<h2>The Delta-normal Model<\/h2>\r\n<p>The delta-normal model is based on the equation (as seen earlier):<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\sum _{ \\text{i} }^{}{ { \\delta }_{ \\text{i} } } \\Delta{\\text{S}}_{\\text{i}} $$<\/p>\r\n<p>Note that this equation gives an exact value in a linear portfolio and an approximate value in nonlinear portfolios.<\/p>\r\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1389\" height=\"1098\" class=\"aligncenter size-full wp-image-6922\" style=\"max-width: 100%;\" src=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15.jpg\" alt=\"Delta-normal Model\" srcset=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15.jpg 1389w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-300x237.jpg 300w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-768x607.jpg 768w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-1024x809.jpg 1024w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-400x316.jpg 400w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-600x474.jpg 600w\" sizes=\"auto, (max-width: 1389px) 100vw, 1389px\" \/>Also, recall that we have two types of risk factors:<\/p>\r\n<ol>\r\n\t<li>Those whose past percentage change is to define the future percentage.<\/li>\r\n\t<li>Those whose past actual change is used to define an actual change in the future.<\/li>\r\n<\/ol>\r\n<p>To accommodate both types of risk factors, the equation above is written as:<\/p>\r\n<p>$$ \\Delta{\\text{P}}=\\sum _{ \\text{i} }^{}{ { \\text{a} }_{ \\text{i} } } {\\text{x}}_{\\text{i}} $$<\/p>\r\n<p>For risk factors where percentage changes are used, \\({ \\text{a} }_{ \\text{i} }=\\frac{\\Delta{ \\text{S} }_{ \\text{i} }}{{ \\text{S} }_{ \\text{i} }} \\) and \\({ \\text{x} }_{ \\text{i} }={ \\delta }_{ \\text{i} } { \\text{S} }_{ \\text{i} }\\).<\/p>\r\n<p>And for the risk factors where actual changes are considered \\({ \\text{a} }_{ \\text{i} }=\\Delta{ \\text{S} }_{ \\text{i} }\\) and \\({ \\text{x} }_{ \\text{i} }={ \\delta }_{ \\text{i} } \\).<\/p>\r\n<p>From the resulting equations, the mean and the standard deviation of the change in portfolio value can be calculated as:<\/p>\r\n<p>$$ \\begin{align*} { \\mu }_{\\text{P}}&amp;=\\sum _{ \\text{i}=1 }^{\\text{n}}{ { \\text{a} }_{ \\text{i} } }{ \\mu }_{\\text{i}} \\\\ \\sigma _{ \\text{P} }^{2}&amp;=\\sum _{ \\text{i}=1 }^{ n }{ \\sum _{ \\text{j}=1 }^{ \\text{n} }{ \\text{a}_{ \\text{i} }\\text{a}_{ \\text{j} }{ { \\rho }_{ \\text{ij} }\\sigma }_{ \\text{i} }{ \\sigma }_{ \\text{j} } } } \\end{align*} $$<\/p>\r\n<p>Where:<\/p>\r\n<p>\\({ \\mu }_{\\text{i}}\\) and \\({ \\sigma }_{\\text{i}}\\) are the mean and standard deviation of \\({ \\text{x} }_{ \\text{i} }\\), respectively.<\/p>\r\n<p>\\({ \\rho }_{ \\text{ij} }\\) is the coefficient of correlation between \\({ \\text{x} }_{ \\text{i} }\\) and \\({ \\text{x} }_{ \\text{j} }\\).<\/p>\r\n<p>The formula for the standard deviation can be written as:<\/p>\r\n<p>$$ \\sigma _{ \\text{P} }^{2}=\\text{a} _{ \\text{i} }^{2}\\sigma_{ \\text{i} }^{2}+2\\sum _{ \\text{i&gt;j} }^{ }\\text{a}_{ \\text{i} }\\text{a}_{ \\text{j} }{ { \\rho }_{ \\text{ij} }\\sigma }_{ \\text{i} }{ \\sigma }_{ \\text{j} } $$<\/p>\r\n<p>Assuming that the portfolio changes are normally distributed, we can comfortably compute VaR and ES. Remember that the VaR is given by:<\/p>\r\n<p>$$\\begin{align*} \\text{VaR}&amp;={\\mu}_{\\text{P}}+{\\sigma}_{\\text{P}} {\\text{U}} \\\\ {ES}&amp;={\\mu}_{\\text{P}}+{\\sigma}_{\\text{P}}\\left(\\cfrac { { \\text{e} }^{ -\\frac { { \\text{U} }^{ 2 } }{ 2 } } }{ \\left( 1-{ \\text{X} } \\right) \\sqrt { 2\\pi } } \\right) \\end {align*}$$<\/p>\r\n<p>Where:<\/p>\r\n<p>X = Confidence level<\/p>\r\n<p>U = Point on the normal distribution where X is exceeded<\/p>\r\n<p>For instance, if X=95% then U=\\({ \\Phi }^{-1} (0.05)=-1.645.\\)<\/p>\r\n<p>At this point, you might guess where the name &#8220;delta-normal&#8221; comes from: the model uses deltas of the risk factors and assumes that the portfolio changes are normally distributed.<\/p>\r\n<p>A typical assumption is that the mean change in the risk factor is zero. This assumption is sometimes not reasonable but is useful when dealing with short time periods. This is because the mean is less than the standard deviation for short periods when dealing with portfolio value changes. As such, VaR and ES are given by:<\/p>\r\n<p>$$ \\begin{align*} \\text{VaR}&amp; ={\\sigma}_{\\text{P}} {\\text{U}} \\\\ \\text{ES}&amp; ={\\sigma}_{\\text{P}}\\left(\\cfrac { { \\text{e} }^{ -\\frac { { \\text{U} }^{ 2 } }{ 2 } } }{ \\left( 1-{ \\text{X} } \\right) \\sqrt { 2\\pi } } \\right) \\end{align*} $$<\/p>\r\n<h3>Example: \u00a0Calculating Expected Shortfall and VaR Using Delta-Normal Model<\/h3>\r\n<p><strong>T<\/strong>he investment return over a period of time has a normal loss distribution with a mean of -100 and a variance of 400.<\/p>\r\n<p>Using the delta-normal model, calculate the \u00a099% Expected Shortfall and the 99% VaR of the loss distribution.<\/p>\r\n<h3>Solution<\/h3>\r\n<p>$$\\begin{align*}\\mathrm{ES}&amp;=\\sigma_{\\mathrm{p}}\\left(\\frac{\\mathrm{e}^{-\\frac{\\mathrm{U}^{2}}{2}}}{(1-\\mathrm{x}) \\sqrt{2 \\pi}}\\right)\\\\ &amp;=20\\left(\\frac{\\mathrm{e}^{-\\frac{2.33^{2}}{2}}}{(1-0.99) \\sqrt{2 \\pi}}\\right)=52.85 \\end{align*}$$<\/p>\r\n<p>Where X is the confidence level and\u00a0 U is the point on the normal distribution where X is exceeded<\/p>\r\n<p>The 99% VaR is given by:<\/p>\r\n<p>$$\\text{VaR}=\\sigma_{\\mathrm{p}} \\text{U} =20 \\times(-2.33)=-46.6$$<\/p>\r\n<h3>Limitations of Delta-normal Model<\/h3>\r\n<p>The method has several disadvantages, chief among them being that:<\/p>\r\n<ul>\r\n\t<li>It is computationally easy but quite inaccurate compared to other VaR measurement methods. Put more precisely, it may underestimate the occurrence of extreme losses because it relies on the normal distribution.<\/li>\r\n\t<li>This method is accurate for small moves of the underlying, but <strong>quite inaccurate for large moves.<\/strong> As we can see from the following graph, the slope of the green line is entirely different from the slope of the blue line:<\/li>\r\n<\/ul>\r\n<p><img loading=\"lazy\" decoding=\"async\" width=\"1389\" height=\"1098\" class=\"aligncenter size-full wp-image-6923\" style=\"max-width: 100%;\" src=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-161.jpg\" alt=\"Limitations of Delta-normal Model\" srcset=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-161.jpg 1389w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-161-300x237.jpg 300w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-161-768x607.jpg 768w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-161-1024x809.jpg 1024w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-161-400x316.jpg 400w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-161-600x474.jpg 600w\" sizes=\"auto, (max-width: 1389px) 100vw, 1389px\" \/>For large changes in a nonlinear derivative, we must use the delta + gamma approximation, or full revaluation as we had discussed earlier.<\/p>\r\n<h2>Using Monte Carlo Simulation to Calculate VaR and ES<\/h2>\r\n<p>Monte Carlo approach is similar to that of the historical simulation. It is noteworthy, though, that the Monte Carlo simulation produces scenarios by randomly selecting samples from the distribution assumed for the risk factors instead of using historical data. Monte Carlo simulations work for both linear and nonlinear portfolios.<\/p>\r\n<p>Now, if for instance, we assume that risk factor changes have a multivariate normal distribution (as in delta-normal), Monte Carlo procedure is as follows:<\/p>\r\n<p><strong>Step 1:<\/strong> Calculate the value of the portfolio today using the current values of the risk factors.<\/p>\r\n<p><strong>Step 2:<\/strong> Sample once from the multivariate normal probability distribution of \\(\\Delta{\\text{x}}_{\\text{i}}\\). Sampling should be consistent with the assumed standard deviations and correlations, which are usually approximated from historical data.<\/p>\r\n<p><strong>Step 3:<\/strong> Using the sample values of \\(\\Delta{\\text{x}}_{\\text{i}}\\), determine the values of the risk factors at the end of the period being considered (such as one day).<\/p>\r\n<p><strong>Step 4:<\/strong> Revalue the portfolio using these new risk factor values.<\/p>\r\n<p><strong>Step 5:<\/strong> Subtract the revaluated portfolio from the current portfolio value to determine the loss.<\/p>\r\n<p><strong>Step 6:<\/strong> Repeat step 2 to step 5 multiple times to come up with a probability distribution for the loss.<\/p>\r\n<p>For instance, if a total of 500 trials are conducted in a Monte Carlo simulation, then 99% VaR for the period under consideration will be the fifth-worst loss. Therefore, the expected shortfall will be the average of the four losses worse than VaR.<\/p>\r\n<p>Like other approaches, Monte Carlo simulation computes one-day VaR, and therefore, the following equations apply when we want to compute T-day time horizon VaR and ES:<\/p>\r\n<p>$$ \\begin{align*} \\text{VaR}\\left({ \\text{T} },{ \\text{X} }\\right)&amp;=\\sqrt{ \\text{T} }\\times \\text{VaR}\\left(1,{ \\text{X} }\\right) \\\\ \\text{ES}\\left({ \\text{T} },{ \\text{X} }\\right)&amp;=\\sqrt{ \\text{T} }\\times \\text{ES}\\left(1,{ \\text{X} }\\right) \\end{align*} $$<\/p>\r\n<p>Monte Carlo simulation is slow because it is computationally intensive. This can be explained by the fact that portfolios considered are usually huge, and evaluating each one of them in each trial is quite time-consuming. To address this challenge, the delta-gamma approach can be used (as discussed earlier) to determine the change in the portfolio value. This is called partial simulation.<\/p>\r\n<p>Delta-normal model assumes normal distribution for the risk factors. However, Monte Carlo simulation uses any distribution for the risk factors only if the correlation between the risk factors can be defined.<\/p>\r\n<h3>Estimating the Parameter Values<\/h3>\r\n<p>To execute the Monte Carlo simulation or delta-normal model, an approximation of the standard deviations and correlations of either percentage or actual changes of the risk factors is necessary. The approximation of these parameters is made using recent historical data. More weights can be applied to more recent data using models such as GARCH (1,1), which we will see in the following chapter.<\/p>\r\n<p>In the case of stressed VaR and ES, standard deviations and correlations should be estimated from the past period, which would be considered stressful to the current portfolio.<\/p>\r\n<h2>Correlation Breakdown<\/h2>\r\n<p>During the stressed market conditions, standard deviations as well as correlations increase. This phenomenon was witnessed during the 2007-2008 financial crisis, where default rates of mortgages increased all over the US.<\/p>\r\n<p>Therefore, correlations in a high volatility period are quite different from those of normal market conditions. This phenomenon is referred to as a correlation breakdown. As such, when calculating VaR or ES, risk managers might need to determine what will happen in extreme market conditions.<\/p>\r\n<h2>Worst-case Scenario Analysis<\/h2>\r\n<p>Worst-case scenario analysis focuses on extreme losses at the tail end of a distribution. First, firms assume that an unfavorable event is certain to occur. They then attempt to establish its possible worst outcomes.\u00a0<\/p>\r\n<p>WCS analysis dissects the tail further to establish the range of worst-case losses that could be incurred. For example, within the lowest 5% of returns, we can construct a &#8220;secondary&#8221; distribution that specifies the 1% WCS return.<\/p>\r\n<p>WCS analysis complements the VaR, and here is how. Recall that the VaR specifies the minimum loss for a given percentage, but it stops short of establishing the severity of losses in the tail. WCS analysis goes a step further to describe the distribution of extreme losses more precisely.<\/p>\r\n<blockquote>\r\n<h2>Practice Questions<\/h2>\r\n<h3>Question 1<\/h3>\r\n<p>A risk manager wishes to calculate the VaR for a Nikkei futures contract using the historical simulation approach. The current price of the contract is 955, and the multiplier is 250. For the last 300 days, the following return data has been recorded:<\/p>\r\n<p>-7.8%, -7.0%, -6.2%, -5.2%, -4.6%, -3.2%, -2.0%, \u2026, 3.8%, 4.2%, 4.8%, 5.1%, 6.3%, 6.8%, 7.0%<\/p>\r\n<p>What is the VaR of the position at 99% using the historical simulation methodology?<\/p>\r\n<p>A. $12,415<\/p>\r\n<p>B. $16,713<\/p>\r\n<p>C. $18,623<\/p>\r\n<p>D. $14,803<\/p>\r\n<p>The correct answer is <strong>D.<\/strong><\/p>\r\n<p>The 99% return among 300 observations would be the third-worst observation among the returns \\(((1-0.99)*300=3)\\).<\/p>\r\n<p>Among the returns given above, the third-worst return is \u22126.2%. As such,<\/p>\r\n<p>$$ \\text{VaR}_{(99\\%)} = 6.2\\% \\times 955 \\times 250 = 14,802.50 $$<\/p>\r\n<p><strong>A<\/strong> is incorrect. This answer incorrectly uses the fourth-worst observation as the 99% return among 300 observations.<\/p>\r\n<p><strong>B<\/strong> is incorrect. This answer incorrectly uses the second-worst observation as the 99% return among 300 observations.<\/p>\r\n<p><strong>C<\/strong> is incorrect. This answer incorrectly uses the worst observation as the 99% return among 300 observations.<\/p>\r\n<h3>Question 2<\/h3>\r\n<p>Bank X and Bank Y are two competing investment banks that are calculating the 1-day 99% VaR for an at-the-money call on a non-dividend-paying stock with the following information:<\/p>\r\n<ul>\r\n\t<li>Current stock price: USD 100<\/li>\r\n\t<li>Estimated annual stock return volatility: 20%<\/li>\r\n\t<li>Current Black-Scholes-Merton option value: USD 4.80<\/li>\r\n\t<li>Option delta: 0.7<\/li>\r\n<\/ul>\r\n<p>To compute VaR, Bank X uses the linear approximation method, while Bank Y uses a Monte Carlo simulation method for full revaluation. Which bank will estimate a higher value for the 1-day 99% VaR?<\/p>\r\n<ol type=\"A\">\r\n\t<li>Bank X.<\/li>\r\n\t<li>Bank Y.<\/li>\r\n\t<li>Both will have the same VaR estimate.<\/li>\r\n\t<li>Insufficient information to determine.<\/li>\r\n<\/ol>\r\n<p>The correct answer is <strong>A<\/strong>.<\/p>\r\n<p>The option\u2019s return function is convex with respect to the value of the underlying. Therefore the linear approximation method will always underestimate the true value of the option for any potential change in price. As such, the VaR will always be higher under the linear approximation method than a full revaluation conducted by Monte Carlo simulation analysis. The difference is the bias resulting from the linear approximation, and this bias increases in size with the change in the option price and with the holding period.<\/p>\r\n<p>As a quick summary, linear approximation\u00a0<strong>underestimates <\/strong>true\u00a0price of the option (see the graph below), and as such,\u00a0<strong>overestimates<\/strong>\u00a0the value-at-risk.<\/p>\r\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" width=\"1389\" height=\"1098\" class=\"aligncenter size-full wp-image-6922\" style=\"max-width: 100%;\" src=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15.jpg\" alt=\"Delta-normal Model\" srcset=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15.jpg 1389w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-300x237.jpg 300w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-768x607.jpg 768w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-1024x809.jpg 1024w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-400x316.jpg 400w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2019\/08\/page-15-600x474.jpg 600w\" sizes=\"auto, (max-width: 1389px) 100vw, 1389px\" \/><\/p>\r\n<\/blockquote>\r\n\n            <div \n                class=\"elfsight-widget-pricing-table elfsight-widget\" \n                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Describe and explain the historical simulation approach for computing VaR and ES. Describe the delta-normal approach and use it to calculate VaR&#8230;<\/p>\n","protected":false},"author":3,"featured_media":1526,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7,15],"tags":[],"class_list":["post-890","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-part-1","category-valuation-and-risk-management","blog-post","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Putting VaR to Work | AnalystPrep - FRM Part 1 Study Notes<\/title>\n<meta name=\"description\" content=\"A Linear derivative is one whose value is directly related to the market price of the underlying variable. 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