{"id":477,"date":"2019-10-10T13:27:00","date_gmt":"2019-10-10T13:27:00","guid":{"rendered":"https:\/\/analystprep.com\/cfa-level-1-exam\/?p=477"},"modified":"2026-03-31T12:38:37","modified_gmt":"2026-03-31T12:38:37","slug":"price-elasticity-income-elasticity-cross-elasticity","status":"publish","type":"post","link":"https:\/\/analystprep.com\/cfa-level-1-exam\/economics\/price-elasticity-income-elasticity-cross-elasticity\/","title":{"rendered":"Price Elasticity, Income Elasticity and Cross Elasticity"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"VideoObject\",\n  \"name\": \"Topics in Demand and Supply Analysis (2022 Level I CFA\u00ae Exam \u2013 Reading 8)\",\n  \"description\": \"Learn key microeconomics concepts for CFA Level I, including price, income, and cross-price elasticity, substitution and income effects, Giffen and Veblen goods, marginal utility, breakeven vs. shutdown points, and economies of scale. Understand how producers and consumers interact in markets and how elasticity impacts business strategy and pricing.\",\n  \"uploadDate\": \"2018-11-04T00:00:00+00:00\",\n  \"thumbnailUrl\": \"https:\/\/i.ytimg.com\/vi\/peZTnpzYHPg\/hqdefault.jpg\",\n  \"contentUrl\": \"https:\/\/www.youtube.com\/watch?v=peZTnpzYHPg\",\n  \"embedUrl\": \"https:\/\/www.youtube.com\/embed\/peZTnpzYHPg\",\n  \"duration\": \"PT22M55S\"\n}\n<\/script>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"QAPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Given the demand function \u0394Qdx = 40 \u2013 5Px, calculate the price elasticity of demand at a price of $1.50.\",\n      \"answerCount\": 3,\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The correct answer is A. 0.23. The derivative of the demand function with respect to price is -5. At a price of 1.50, quantity demanded is Q = 40 \u2212 5(1.5) = 32.5. The price elasticity of demand is calculated as (-5) \u00d7 (1.5 \/ 32.5) = 0.23.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/peZTnpzYHPg?si=o7n2FKWxd7h0ucob\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n\n<p>Elasticity measures the sensitivity or responsiveness of one variable to another. There are three main different forms of elasticity \u2013 price elasticity, income elasticity, and cross-price elasticity<\/p>\n<h2>Price Elasticity<\/h2>\n<p>Price elasticity is measured in percentage changes in each of the variables. Thus we calculate elasticity using:<\/p>\n<p>$$ E_{px}^d=\\frac{\\%\\Delta Q_x^d}{\\%\\Delta P_x} $$<\/p>\n<p>Where:<\/p>\n<p>\\(\\%\u0394Q_x^d\\) = the percentage change in quantity demanded; and<\/p>\n<p>\\(\\%\u0394P_x\\) = the percentage change in price.<\/p>\n<p>\\(\\%\u0394Q_x^d\\) can also be written as \\(\\frac{\u0394Q_x^d}{Q_x^d}\\) while\u00a0\\(\\%\u0394P_x\\) can be broken down to \\(\\frac{\u0394P_x }{P_x}\\). Hence elasticity of price can be rewritten as:<\/p>\n<p>$$ E_{px}^d=\\frac{\\%\\Delta Q_x^d}{\\%\\Delta P_x}=\\frac{\\frac{\\Delta Q_x^d}{Q_x^d}}{\\frac{\\Delta P_x}{P_x}}=(\\frac{\\Delta Q_x^d}{Q_x^d})(\\frac{P_x}{\\Delta P_x}) $$<\/p>\n<h3><strong>Example of Elasticity<\/strong><\/h3>\n<p>The annual premium of a certain life insurance company increased from $20 to $25. In this particular year, the number of policies sold decreased from 1000 to 900. Calculate the price elasticity of demand.<\/p>\n<p>From the information given in the question:<\/p>\n<p>$$E_{px}^d=(\\frac{\\Delta Q_x^d}{Q_x^d})(\\frac{P_x}{\\Delta P_x}) =(\\frac{900-1000}{1000})( \\frac{20}{25-20})=-0.4$$<\/p>\n<p>Basically, the main determinant in the price elasticity is the change in price itself.<\/p>\n<h3><strong>Classifications of Price Elasticities of Demand<\/strong><\/h3>\n<ul>\n<li>Demand is <strong>elastic <\/strong>if the price elasticity of demand (PED) is greater than one. That is PED&gt;1. This implies that the quantity demanded changes by a larger proportion than the price.<\/li>\n<li>Demand is <strong>inelastic <\/strong>if PED&lt;1. This implies that the quantity demanded changes by a smaller proportion than the price.<\/li>\n<li>Demand has a unit elasticity if PED= -1. This implies that the percentage change in the quantity demanded and the price changes are equal and in the opposite.<\/li>\n<\/ul>\n<h3><strong>Factors That Affect the Price Elasticity of Demand<\/strong><\/h3>\n<ul>\n<li><strong>Availability of substitute goods: <\/strong>availability of more substitutes translates to a more elastic demand.<\/li>\n<li><strong>Time horizon: <\/strong>generally, it is time-consuming to find alternative goods, and hence, the more time utilized, the more elastic the demand is.<\/li>\n<li><strong>Income:\u00a0<\/strong>this is based on the proportion of income on a good. Intuitively from the formulae, a larger proportion translates to more elastic demand.<\/li>\n<\/ul>\n<h2><strong>Income Elasticity <\/strong><\/h2>\n<p>Income elasticity is defined as the percentage change in quantity demanded divided by the percentage change in the income of the customers ceteris paribus.<\/p>\n<p>Hence income elasticity is given by:<\/p>\n<p>$$E_I^d=\\frac{\\%\\Delta Q_x^d}{\\%\\Delta I}$$<\/p>\n<p>The calculation of the income elasticity is similar to price elasticity. However, \u201cown\u201d price elasticity is always negative, whereas the income elasticity could be negative, positive, or zero.<\/p>\n<p>When an increase in income leads to increased consumption or quantity demanded, there is positive income elasticity. In contrast, negative elasticity means that a reduction in income leads to a decrease in quantity demanded. Examples of goods possessing positive income elasticity are normal goods, while negative income elasticity goods are inferior goods.<\/p>\n<p>Holding every other factor constant, the main determinant of income elasticity is the income of the consumers.<\/p>\n<h3>Example of\u00a0Income Elasticity<\/h3>\n<p>An individual consumer\u2019s monthly demand for apples and its by-products in an African country is given by the equation:<\/p>\n<p>$$Q_a^d=5-0.5P_a+0.005I+0.25P_{ju}$$<\/p>\n<p style=\"text-align: left;\">Where:<\/p>\n<p style=\"text-align: left;\">\\(Q_a^d\\) = number of apples demanded each month<\/p>\n<p style=\"text-align: left;\">\\(P_a\\) = the price of apples<\/p>\n<p style=\"text-align: left;\">\\(I\\) = estimated household monthly income<\/p>\n<p style=\"text-align: left;\">\\(P_{ju}\\) = price of the apple juice<\/p>\n<p>Given that the apple price is $10, that of juice is $20, and the estimated household income is $2,000, calculate the income elasticity of demand for the apples.<\/p>\n<p>Now, using the same analogy as that price elasticity of demand:<\/p>\n<p>$$E_{px}^d=(\\frac{\\Delta Q_a^d}{Q_x^d})(\\frac{P_x}{\\Delta P_x})$$<\/p>\n<p>The income elasticity of demand is given by:<\/p>\n<p>$$E_I^d=(\\frac{\\Delta Q_a^d}{\\Delta I})(\\frac{I}{Q_a^d})$$<\/p>\n<p><em>(Note that we just swopped the denominators.)<\/em><\/p>\n<p>Now,\u00a0<\/p>\n<p>$$\\frac{\\Delta Q_a^d}{\\Delta I}=\\frac{\\partial}{\\partial I}(Q_a^d=5-0.5P_a+0.005I+0.25P_{ju})=0.005$$<\/p>\n<p>and<\/p>\n<p>$$Q_a^d=5-0.5\\times 10+0.005\\times 2000+0.25\\times 20=15$$<\/p>\n<p>$$\\Rightarrow\u00a0E_I^d=0.005\\times \\frac{2000}{15}=0.6667$$<\/p>\n<h2><strong>Cross-price Elasticity <\/strong><\/h2>\n<p>Other than the price of a product and the income of the consumers, the prices of other products can also affect the demand for the product. The cross-price elasticity is defined on this basis. Here, we evaluate the effect of the percentage change in the prices of other products on the quantity of demand for a particular good. This notion is represented mathematically as:<\/p>\n<p>$$E_{P_y}^d=\\frac{\\%\\Delta Q_x^d}{\\%\\Delta P_y}$$\u00a0<\/p>\n<p>Where P<sub>y \u00a0<\/sub>represents the price of other products.<\/p>\n<p>Cross-price elasticity is mostly found in goods with substitutes and complements.<\/p>\n<p>When the price of a good with a close substitute, say cauliflower, increases, the demand for that particular product will likely shift to another vegetable, say broccoli. This relationship describes positive cross-price elasticity.<\/p>\n<p>Conversely, goods of complement, say cell phones and chargers, have negative cross-price elasticity. In other words, an increase in the price of phones may reduce the quantity demanded of phones; consequently, the quantity demanded of phone chargers will also decline.<\/p>\n<h3><strong>Example of Cross-price Elasticity<\/strong><\/h3>\n<p>The cross-price elasticity of demand for Good B\u00a0 with respect to good A is 0.65. 1000kg of Good B is demanded when the cost of good A is $60 per kg. The cost of Good A rises to $100. Calculate the corresponding quantity of Good B demanded.<\/p>\n<p>Recall that:<\/p>\n<p>$$E_{P_y}^d=\\frac{\\%\\Delta Q_x^d}{\\%\\Delta P_y}$$\u00a0<\/p>\n<p>But<\/p>\n<p>$$\\%\\Delta P_y =\\frac{100-60}{60}\\times 100=66.6667\\%$$<\/p>\n<p>Substituting in the formula:<\/p>\n<p>$$0.65=\\frac{\\%\\Delta Q_x^d}{66.6667\\%} \\Rightarrow\u00a0\\%\\Delta Q_x^d=43.333\\%$$<\/p>\n<p>This implies that we expect the increase in demand for Good B, so the corresponding quantity is:<\/p>\n<p>$$1.43333\\times 1000=1,433.33\\approx 1,433$$<\/p>\n<blockquote>\n<h2><strong>Question<\/strong><\/h2>\n<p>Given the demand function \\(\u0394Q_x^d\\)\u00a0<em>= 40 &#8211; 5P<sub>x, <\/sub><\/em>calculate the price elasticity of demand at a price of $1.50.<\/p>\n<p>A. 0.23<\/p>\n<p>B. 0.45<\/p>\n<p>C. 3.45<\/p>\n<p>The correct answer is A<\/p>\n<p>A unit change (an increase) in price will lead to a 5 unit decrease in demand. If, for instance, the price changes to $1.5, the elasticity or percentage change can be calculated as shown below.<\/p>\n<p>Differentiating the demand function to get the elasticity of demand will give us -5.<\/p>\n<p>Multiplying the demand elasticity with the ratio of price to quantity will give us:<\/p>\n<p>$$Q = 40 \u2013 (5)(1.5) = 32.5$$<\/p>\n<p>Hence, the elasticity of demand at a price of $1.5 is:<\/p>\n<p>$$(\\frac{\\Delta Q_x^d}{Q_x^d})(\\frac{P_x}{\\Delta P_x}) =-(5) \\frac{1.5}{32.5}=0.23$$<\/p>\n<\/blockquote>\n<div class=\" notes_inv\"><hr \/>\n<p><a href=\"https:\/\/analystprep.com\/cfa-level-1-exam\/economics\/learning-sessions-curriculum-economics\/\"><em>Economics &#8211; Learning Sessions<\/em><\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Elasticity measures the sensitivity or responsiveness of one variable to another. There are three main different forms of elasticity \u2013 price elasticity, income elasticity, and cross-price elasticity Price Elasticity Price elasticity is measured in percentage changes in each of the&#8230;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-477","post","type-post","status-publish","format-standard","hentry","category-economics","blog-post","no-post-thumbnail","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Price, Income &amp; Cross Elasticities | CFA Level 1<\/title>\n<meta name=\"description\" content=\"Learn how price, income, and cross elasticity impact demand, and how to calculate and interpret these economic measures.\" \/>\n<meta name=\"robots\" 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