{"id":14886,"date":"2021-05-07T09:26:46","date_gmt":"2021-05-07T09:26:46","guid":{"rendered":"https:\/\/analystprep.com\/study-notes\/?p=14886"},"modified":"2026-07-06T20:47:58","modified_gmt":"2026-07-06T20:47:58","slug":"components-of-the-bsm-model","status":"publish","type":"post","link":"https:\/\/analystprep.com\/study-notes\/cfa-level-2\/components-of-the-bsm-model\/","title":{"rendered":"Components of the BSM Model"},"content":{"rendered":"\r\n<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\": \"Using the BSM model, what is the value of the replicating portfolio for a call option on common stock?\",\r\n    \"text\": \"Common stock is currently trading at $50. A call option is written on it with an exercise price of $45. The continuously compounded risk-free rate of interest is 4%, the interest rate volatility is 30%, and the time to option expiry is 2 years. Using the BSM model, the following components have been calculated: PV(K) = $41.54, d1 = 0.6490, d2 = 0.2248, N(d1) = 0.7418, N(d2) = 0.5889, and c0 = $12.63. The value of the replicating portfolio is closest to: A. $9.57 B. $11.94 C. $12.63.\",\r\n    \"answerCount\": 1,\r\n    \"acceptedAnswer\": {\r\n      \"@type\": \"Answer\",\r\n      \"text\": \"The correct answer is C. The value of the replicating portfolio is $12.63. Under the no-arbitrage approach, the call option can be replicated by purchasing N(d1) shares of stock and borrowing an amount equal to N(d2) multiplied by the present value of the exercise price. Here, the portfolio consists of buying 0.7418 shares of stock and financing part of the purchase by shorting 0.5889 zero-coupon bonds priced at $41.54 each. The cost of the replicating portfolio is calculated as 0.7418 \u00d7 $50 + (-0.5889 \u00d7 $41.54), which equals $12.63. Therefore, the replicating portfolio has the same value as the call option.\"\r\n    }\r\n  }\r\n}\r\n<\/script>\r\n<p>The BSM model for pricing options on a non-dividend-paying stock is given by:<\/p>\r\n<h4>European call<\/h4>\r\n<p>$$c_{0}=S_{0}N(d_{1})-e^{-rT}KN(d_{2})$$<\/p>\r\n<h4>European Put<\/h4>\r\n<p>$$p_{o}=e^{-rT}KN(-d_{2})-S_{0}N(-d_{1})$$<\/p>\r\n<p>Where:\u00a0<\/p>\r\n<p>$$d_{1}=\\frac{ln\\bigg(\\frac{S}{K}\\bigg)+\\bigg(r+\\frac{1}{2}\\sigma^{2}\\bigg)T}{\\sigma\\sqrt{T}}$$<\/p>\r\n<p>$$d_{2}=d_{1}-\\sigma\\sqrt{T}$$<\/p>\r\n<p>\\(N(x)=\\) standard normal cumulative distribution function<\/p>\r\n<p>\\(N(\u2013x) = 1 \u2013 N(x)\\)<\/p>\r\n<p>BSM Model has the following variables:<\/p>\r\n<p>\\(T=\\) time to option expiration<\/p>\r\n<p>\\(r=\\) continuously compounded risk-free rate<\/p>\r\n<p>\\(S_{0}=\\) current share price<\/p>\r\n<p>\\(K=\\) exercise price<\/p>\r\n<p>\\(\\sigma=\\) annual volatility of asset returns<\/p>\r\n<div style=\"margin: 18px 0;\">\r\n  <a style=\"display: block; text-align: center; padding: 14px 18px; border: 2px solid #2F5BFF; border-radius: 18px; color: #ffffff; font-weight: 600; font-size: 16px; text-decoration: none; background-color: #1a73e8;\" href=\"https:\/\/analystprep.com\/free-trial\/\" target=\"_blank\" rel=\"noopener noreferrer\">\r\n    Master CFA Level 2 BSM model components with AnalystPrep\u2019s Free Trial.\r\n  <\/a>\r\n<\/div>\r\n\r\n<h2>Interpretation of the BSM Model<\/h2>\r\n<p>The BSM model can be interpreted as the present value of the expected option payoff at expiration. It can be expressed as:<\/p>\r\n<p>$$c_{0}=PV(S_{0}e^{rT}N(d_{1})-KN(d_{2}))$$<\/p>\r\n<p>$$p_{0}=PV(KN(-d_{2})-S_{0}e^{rT}N(-d_{i}))$$<\/p>\r\n<p>Where the present value factor in this case is \\(e^{-rT}\\)<\/p>\r\n<p>Alternatively, the BSM model can be described as having two components, a <strong><em>stock component<\/em>,<\/strong> and a <em><strong>bond component<\/strong><\/em>.<\/p>\r\n<p>The stock component for call options is \\(S_{0}N(d_{1})\\) while the bond component is \\(e^{-rT}KN(d_{2})\\). Thus, the BSM model call value is the difference between the stock component and the bond component.<\/p>\r\n<p>The stock component is \\(S_{0}N(d_{1})\\) and the bond component is \\(e^{rT}KN(-d_{2})\\) for put options. Thus, the BSM model put value is the bond component minus the stock component.<\/p>\r\n<p>An option can be thought of as a dynamically managed portfolio of the underlying stock and zero-coupon bonds. The initial cost of this replicating strategy is given as:<\/p>\r\n<p>$$\\text{Replicating strategy cost}=n_{s}S+n_{B}B$$<\/p>\r\n<h2>Call Options<\/h2>\r\n<p>The equivalent number of underlying shares is \\(n_{S}=N(d_{1})&gt;0\\). \\(n_{S}\\) greater than 0 implies that we are buying the stock. On the other hand, the equivalent number of bonds is \\(n_{B}=-N(d_{2})&lt;0\\). \\(n_{B}\\) less than 0 implies that we are selling the bond. Selling a bond is the same as borrowing money. Thus, a call option can be viewed as a<em> <strong>leveraged <\/strong><\/em>position in the stock where \\(N(d_{1})\\) units of shares are purchased using \\(e^{-rT}KN(d_{2})\\) of borrowed money.<\/p>\r\n<h2>Put options<\/h2>\r\n<p>The equivalent number of underlying shares is \\(n_{S}=-N(-d_{1})&lt;0\\).\u00a0 This can be interpreted as selling the shares of the underlying stock as \\(n_{s}&lt;0\\). Further, the equivalent number of bonds is \\(n_{B}=-N(-d_{2})&gt;0\\).\u00a0The bond is being bought here as \\(n_{B}\\) is greater than 0. Buying a bond similar to lending money. Therefore, a put can be viewed as buying a bond where this purchase is partially financed by short selling the underlying stock.<\/p>\r\n<h3>Example: Interpreting BSM Model Components<\/h3>\r\n<p>Consider the following information relating to call and put options on an underlying stock<\/p>\r\n<p>\\(S_{0}=48\\)<\/p>\r\n<p>\\(K=40\\)<\/p>\r\n<p>\\(r=2.5\\%\\) (Continuously compounded)<\/p>\r\n<p>\\(T=2\\)<\/p>\r\n<p>\\(\\sigma=30\\%\\)<\/p>\r\n<p>Current market price of call option = 14<\/p>\r\n<p>Current market price of put option = 3<\/p>\r\n<p>The following values have been calculated using the above information<\/p>\r\n<p>$$PV(K)=40\\times e^{-0.025\\times2}=38.05$$<\/p>\r\n<p>$$d_{1}=0.7597$$<\/p>\r\n<p>$$d_{2}=0.3354$$<\/p>\r\n<p>$$N(d_{1})=0.7763$$<\/p>\r\n<p>$$N(d_{2})=0.6314$$<\/p>\r\n<p>We can determine the replicating strategy cost and arbitrage profits on both options as follows:<\/p>\r\n<p>According to the no-arbitrage approach to replicating the call option, a trader can:<\/p>\r\n<p>Purchase \\(n_{s}=N(d_{1})=0.7763\\) shares of stock by borrowing \\(n_{B}=-N(d_{2})=0.6314\\) shares of zero-coupon bonds priced at \\(B=ke^{-rT}=$38.05\\) per bond.<\/p>\r\n<p>$$\\text{Replicating strategy cost}=n_{S}S+n_{B}B$$<\/p>\r\n<p>$$\\text{Replicating strategy cost}=0.7763\\times48+(-0.6314\\times38.05)=$13.24$$<\/p>\r\n<p>An arbitrage profit can be realized on the call option by writing a call at the current market price of $14 and purchasing a replicating portfolio for $13.24.<\/p>\r\n<p>Thus,<\/p>\r\n<p>$$\\text{Arbitrage profit}=$14-$13.24=$0.76$$<\/p>\r\n<p>For the put option, we have:<\/p>\r\n<p>$$N(-d_{1})=1-N(d_{1})=1-0.7763=0.2237$$<\/p>\r\n<p>$$N(-d_{2})=1-0.6314=0.3686$$<\/p>\r\n<p>The no-arbitrage approach to replicating the put option involves:<\/p>\r\n<p>Purchasing \\(n_{B}=N(-d_{2})=0.3686\\) shares of zero-coupon bonds priced at \\(40e^{-0.025\\times2}=$38.05\\) per bond and short-selling \\(n_{S}=-N(-d_{1})=-0.2237\\) shares of stock resulting in short proceeds of \\($48\\times0.2237=$10.74\\)<\/p>\r\n<p>Thus, the replicating strategy cost for the put option is:<\/p>\r\n<p>$$\\text{Replicating strategy cost}=-0.2237\\times$48+0.3686\\times$38.05=$3.29$$<\/p>\r\n<p>The trader can exploit arbitrage profits by selling the replicating portfolio and purchasing puts for an arbitrage profit of $0.29 per put.<\/p>\r\n<p>i.e., \\(\\text{Arbitrage profit}=$3.29-$3=$0.29\\)<\/p>\r\n<blockquote>\r\n<h2>Question<\/h2>\r\n<p>Common stock is currently trading at $50. A call option is written on it with an exercise price of $45. Further, the continuously compounded risk-free rate of interest is 4%, the interest rate volatility is 30%, and the time to the option expiry is 2 Years. Using the BSM model, the following components have been calculated:<\/p>\r\n<p>\\(PV(K)=$41.54\\)<\/p>\r\n<p>\\(d_{1}=0.6490\\)<\/p>\r\n<p>\\(d_{2}=0.2248\\)<\/p>\r\n<p>\\(N(d_{1})=0.7418\\)<\/p>\r\n<p>\\(N(d_{2})=0.5889\\)<\/p>\r\n<p>\\(c_{0}=12.63\\)<\/p>\r\n<p>The value of the replicating portfolio is<em> closest to:<\/em><\/p>\r\n<ol style=\"list-style-type: upper-alpha;\">\r\n<li>$9.57<\/li>\r\n<li>$11.94<\/li>\r\n<li>$12.63<\/li>\r\n<\/ol>\r\n<h3>Solution<strong>\u00a0<\/strong><\/h3>\r\n<p><strong>The correct answer is C:<\/strong><\/p>\r\n<p>The no-arbitrage approach to replicating the call option involves purchasing \\(n_{s}=N(d_{1})=\\text{0.7418 shares}\\) of stock partially financed with \\(n_{B}=-N(d_{2})=-0.5889\\) shares of zero-coupon bonds priced at \\(B=Ke^{rT}=\\text{\\$41.54 per bond}\\).<\/p>\r\n<p>Cost of replicating portfolio \\(=n_{S}S+n_{B}B\\)<\/p>\r\n<p>$$c=0.7418(50)+(-0.5889)41.54=$12.63$$<\/p>\r\n<\/blockquote>\r\n<p><em>Reading 38: Valuation of Contingent Claims<\/em><\/p>\r\n<p><em>LOS 38 (g). interpret the components of the Black\u2013Scholes\u2013Merton model as applied to call options in terms of a leveraged position in the underlying; <\/em><\/p>\r\n\r\n<div style=\"text-align: center; margin: 30px 0;\">\r\n  <a style=\"display: inline-flex; align-items: center; justify-content: center; padding: 12px 26px; border-radius: 9999px; background: #1e5bd8; color: #ffffff; font-weight: bold; text-decoration: none;\" href=\"https:\/\/analystprep.com\/free-trial\/\" target=\"_blank\" rel=\"noopener noreferrer\">\r\n    Start Free Trial \u2192\r\n  <\/a>\r\n  <p style=\"margin-top: 12px; font-size: 16px; line-height: 1.5;\">\r\n    Build confidence in CFA Level 2 derivatives with study notes, practice questions, mock exams, and video lessons covering BSM model components, option valuation, and exam-style applications.\r\n  <\/p>\r\n<\/div>","protected":false},"excerpt":{"rendered":"<p>The BSM model for pricing options on a non-dividend-paying stock is given by: European call $$c_{0}=S_{0}N(d_{1})-e^{-rT}KN(d_{2})$$ European Put $$p_{o}=e^{-rT}KN(-d_{2})-S_{0}N(-d_{1})$$ Where:\u00a0 $$d_{1}=\\frac{ln\\bigg(\\frac{S}{K}\\bigg)+\\bigg(r+\\frac{1}{2}\\sigma^{2}\\bigg)T}{\\sigma\\sqrt{T}}$$ $$d_{2}=d_{1}-\\sigma\\sqrt{T}$$ \\(N(x)=\\) standard normal cumulative distribution function \\(N(\u2013x) = 1 \u2013 N(x)\\) BSM Model has the following variables: \\(T=\\)&#8230;<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[102,302],"tags":[216,332,304],"class_list":["post-14886","post","type-post","status-publish","format-standard","hentry","category-cfa-level-2","category-derivatives","tag-cfa-level-2","tag-components-of-the-bsm-model","tag-derivatives","blog-post","no-post-thumbnail","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Components of the BSM Model | CFA Level 2<\/title>\n<meta name=\"description\" content=\"Learn the key components of the Black-Scholes model and how stock, bond, volatility, and time determine option values. 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