{"id":6384,"date":"2018-02-05T15:35:25","date_gmt":"2018-02-05T15:35:25","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/wm-microeconomics\/chapter\/reading-the-foundations-of-demand-curve\/"},"modified":"2018-06-11T18:18:05","modified_gmt":"2018-06-11T18:18:05","slug":"the-foundations-of-demand-curve","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/cuny-kbcc-microeconomics\/chapter\/the-foundations-of-demand-curve\/","title":{"raw":"The Foundations of the Demand Curve","rendered":"The Foundations of the Demand Curve"},"content":{"raw":"<div class=\"textbox learning-objectives\">\r\n<h3>Learning Objectives<\/h3>\r\n<ul class=\"list\">\r\n \t<li class=\"item\">Describe how demand curves are derived from consumer equilibrium<\/li>\r\n<\/ul>\r\n<\/div>\r\nIn this module, we've learned how consumers spend their limited income in order to maximize total utility. Each consumer choice problem yields a consumer equilibrium, showing the combination of goods and services an individual chooses to purchase with their budget, given the individual's preferences and given the prices of the goods and services available.\r\n\r\nRemember that a demand curve shows the relationship between price of a product and quantity demanded. While demand curves will appear somewhat different for each product - they may appear relatively steep or flat, straight or curved - demand curves slope down from left to right. So demand curves embody the law of demand: as the price increases, the quantity demanded decreases, and conversely, as the price decreases, the quantity demanded increases.\r\n\r\nIn this section, we explore the relationship between consumer equilibrium and demand curves.\r\n<h2>The Foundations of Demand Curves<\/h2>\r\n<span style=\"color: #0000ff;\"><span style=\"color: #333333;\">Fig<\/span><\/span>ure 1 shows a budget constraint with a choice between housing and \u201ceverything else.\u201d (Putting \u201ceverything else\u201d on the vertical axis can be a useful approach in some cases, especially when the focus of the analysis is on one particular good.) We label the consumer equilibrium, M<sub>0<\/sub>.\u00a0This consumer equilibrium was found by applying the two rules used to maximize utility explained earlier.\r\n\r\n[caption id=\"attachment_8458\" align=\"aligncenter\" width=\"390\"]<img class=\"wp-image-8458 size-full\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2042\/2018\/02\/27040349\/CNX_Econ_C06_0041_housing.jpg\" alt=\"Graph with everything else on the y-axis and housing on the x-axis. Point M represents the equilibrium point.\" width=\"390\" height=\"274\" \/> <strong>Figure 1.<\/strong> A Choice between Housing and Everything Else.\u00a0The points on the budget constraint show the combinations of Housing and a composite good of Everything Else that are affordable. The consumer equilibrium occurs at Point M.[\/caption]\r\n\r\nConsider how changes in the price of a good affect the budget constraint and the consumer equilibrium. An increase in the price of housing will not change the quantity of \"everything else\" that the consumer is able to buy. If the consumer were to spend their entire budget on \"everything else,\" they could still afford the amount shown by the vertical axis of the budget constraint. But it will reduce the amount of housing the consumer can purchase. Thus, if the price of housing increases, the budget constraint will rotate towards the horizontal axis. This is shown in Figure 2 below.\r\n\r\nThe other three budget constraints represent successively higher prices for housing of P<sub>1<\/sub>, P<sub>2<\/sub>, and P<sub>3<\/sub>. As the budget constraint rotates in, and in, and in again, we label the utility-maximizing choices M<sub>1<\/sub>, M<sub>2<\/sub>, and M<sub>3<\/sub>, and the quantity demanded of housing falls from Q<sub>0<\/sub>\u00a0to Q<sub>1<\/sub>\u00a0to Q<sub>2<\/sub>\u00a0to Q<sub>3<\/sub>.\r\n\r\n[caption id=\"attachment_6660\" align=\"aligncenter\" width=\"390\"]<img class=\"wp-image-6660 size-full\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2042\/2018\/02\/08204236\/CNX_Econ_C06_0041.jpg\" alt=\"The two graphs show how budget constraints influence the demand curve.\" width=\"390\" height=\"610\" \/> <strong>Figure 2.<\/strong>\u00a0<strong>From Budget Constraint to Demand Curve.<\/strong> (a) As the price increases from P<sub>0<\/sub> to P<sub>1<\/sub> to P<sub>2<\/sub> to P<sub>3<\/sub>, the budget constraint on the upper part of the diagram rotates clockwise. The utility-maximizing choice changes from M<sub>0<\/sub> to M<sub>1<\/sub> to M<sub>2<\/sub> to M<sub>3<\/sub>. As a result, the quantity demanded of housing shifts from Q<sub>0<\/sub> to Q<sub>1<\/sub> to Q<sub>2<\/sub> to Q<sub>3<\/sub>, ceteris paribus. (b) The demand curve graphs each combination of the price of housing and the quantity of housing demanded, ceteris paribus. The quantities of housing are the same at the points on both (a) and (b). Thus, the original price of housing (P<sub>0<\/sub>) and the original quantity of housing (Q<sub>0<\/sub>) appear on the demand curve as point E<sub>0<\/sub>. The higher price of housing (P<sub>1<\/sub>) and the corresponding lower quantity demanded of housing (Q<sub>1<\/sub>) appear on the demand curve as point E<sub>1<\/sub>.[\/caption]\r\n\r\nSo, as the price of housing rises, the budget constraint rotates clockwise (inward), and the quantity consumed of housing falls, <span class=\"emphasis\"><em>ceteris paribus<\/em><\/span> (meaning, with all other things being the same). This relationship\u2014the price of housing rising from P<sub>0<\/sub> to P<sub>1<\/sub> to P<sub>2<\/sub> to P<sub>3<\/sub>, while the quantity of housing demanded falls from Q<sub>0<\/sub> to Q<sub>1<\/sub> to Q<sub>2<\/sub> to Q<sub>3<\/sub>\u2014is graphed on the demand curve in Figure 2(b). Indeed, the vertical dashed lines stretching between the top and bottom of Figure 1 show that the quantity of housing demanded at each point is the same in both (a) and (b). Thus, the shape of a demand curve is ultimately determined by the underlying choices about maximizing utility subject to a budget constraint. And while economists may not be able to measure \"utils,\" they can certainly measure price and quantity demanded.\r\n<h2><span class=\"cnx-gentext-section cnx-gentext-t\">Applications in Government and Business\u00a0<\/span><\/h2>\r\nThe budget constraint framework for making utility-maximizing choices offers a reminder that people can react to a change in price or income in a range of different ways. For example, in the winter months of 2005, costs for heating homes increased significantly in many parts of the country as prices for natural gas and electricity soared, due in large part to the disruption caused by Hurricanes Katrina and Rita. Some people reacted by reducing the quantity demanded of energy; for example, by turning down the thermostats in their homes by a few degrees and wearing a heavier sweater inside. Even so, many home heating bills rose, so people adjusted their consumption in other ways, too. As you learned in the module on <span style=\"color: #333333;\">E<\/span>lasticity, the short run demand for home heating is generally inelastic. Each household cut back on what it valued least on the margin; for some it might have been some dinners out, or a vacation, or postponing buying a new refrigerator or a new car. Indeed, sharply higher energy prices can have effects beyond the energy market, leading to a widespread reduction in purchasing throughout the rest of the economy.\r\n\r\nA similar issue arises when the government imposes taxes on certain products, like it does on gasoline, cigarettes, and alcohol. Say that a tax on alcohol leads to a higher price at the liquor store, the higher price of alcohol causes the budget constraint to pivot left, and consumption of alcoholic beverages is likely to decrease. However, people may also react to the higher price of alcoholic beverages by cutting back on other purchases. For example, they might cut back on snacks at restaurants like chicken wings and nachos. It would be unwise to assume that the liquor industry is the only one affected by the tax on alcoholic beverages.\r\n<div class=\"textbox key-takeaways\">\r\n<h3><strong>Does it make a difference who controls household income?<\/strong><\/h3>\r\nIn the mid-1970s, the United Kingdom made an interesting policy change in its \"child allowance\" policy. This program provides a fixed amount of money per child to every family, regardless of family income. Traditionally, the child allowance had been distributed to families by withholding less in taxes from the paycheck of the family wage earner\u2014typically the father in this time period. The new policy instead provided the child allowance as a cash payment to the mother. As a result of this change, households have the same level of income and face the same prices in the market, but the money is more likely to be in the purse of the mother than in the wallet of the father.\r\n\r\nShould this change in policy alter household consumption patterns? Basic models of consumption decisions, of the sort examined in this module, assume that it does not matter whether the mother or the father receives the money, because both parents seek to maximize the utility of the family as a whole. In effect, this model assumes that everyone in the family has the same preferences.\r\n\r\nIn reality, the share of income controlled by the father or the mother does affect what the household consumes. When the mother controls a larger share of family income a number of studies, in the United Kingdom and in a wide variety of other countries, have found that the family tends to spend more on restaurant meals, child care, and women's clothing, and less on alcohol and tobacco. As the mother controls a larger share of household resources, children's health improves, too. These findings suggest that when providing assistance to poor families, in high-income countries and low-income countries alike, the monetary amount of assistance is not all that matters: it also matters which member of the family actually receives the money.\r\n\r\n<\/div>\r\nThe budget constraint framework serves as a constant reminder to think about the full range of effects that can arise from changes in income or price, not just effects on the one product that might seem most immediately affected.\r\n<div class=\"textbox tryit\">\r\n<h3>Try It<\/h3>\r\nhttps:\/\/assessments.lumenlearning.com\/assessments\/7964\r\n\r\nhttps:\/\/assessments.lumenlearning.com\/assessments\/7965\r\n\r\n<\/div>\r\nhttps:\/\/assessments.lumenlearning.com\/assessments\/7775\r\n","rendered":"<div class=\"textbox learning-objectives\">\n<h3>Learning Objectives<\/h3>\n<ul class=\"list\">\n<li class=\"item\">Describe how demand curves are derived from consumer equilibrium<\/li>\n<\/ul>\n<\/div>\n<p>In this module, we&#8217;ve learned how consumers spend their limited income in order to maximize total utility. Each consumer choice problem yields a consumer equilibrium, showing the combination of goods and services an individual chooses to purchase with their budget, given the individual&#8217;s preferences and given the prices of the goods and services available.<\/p>\n<p>Remember that a demand curve shows the relationship between price of a product and quantity demanded. While demand curves will appear somewhat different for each product &#8211; they may appear relatively steep or flat, straight or curved &#8211; demand curves slope down from left to right. So demand curves embody the law of demand: as the price increases, the quantity demanded decreases, and conversely, as the price decreases, the quantity demanded increases.<\/p>\n<p>In this section, we explore the relationship between consumer equilibrium and demand curves.<\/p>\n<h2>The Foundations of Demand Curves<\/h2>\n<p><span style=\"color: #0000ff;\"><span style=\"color: #333333;\">Fig<\/span><\/span>ure 1 shows a budget constraint with a choice between housing and \u201ceverything else.\u201d (Putting \u201ceverything else\u201d on the vertical axis can be a useful approach in some cases, especially when the focus of the analysis is on one particular good.) We label the consumer equilibrium, M<sub>0<\/sub>.\u00a0This consumer equilibrium was found by applying the two rules used to maximize utility explained earlier.<\/p>\n<div id=\"attachment_8458\" style=\"width: 400px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-8458\" class=\"wp-image-8458 size-full\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2042\/2018\/02\/27040349\/CNX_Econ_C06_0041_housing.jpg\" alt=\"Graph with everything else on the y-axis and housing on the x-axis. Point M represents the equilibrium point.\" width=\"390\" height=\"274\" \/><\/p>\n<p id=\"caption-attachment-8458\" class=\"wp-caption-text\"><strong>Figure 1.<\/strong> A Choice between Housing and Everything Else.\u00a0The points on the budget constraint show the combinations of Housing and a composite good of Everything Else that are affordable. The consumer equilibrium occurs at Point M.<\/p>\n<\/div>\n<p>Consider how changes in the price of a good affect the budget constraint and the consumer equilibrium. An increase in the price of housing will not change the quantity of &#8220;everything else&#8221; that the consumer is able to buy. If the consumer were to spend their entire budget on &#8220;everything else,&#8221; they could still afford the amount shown by the vertical axis of the budget constraint. But it will reduce the amount of housing the consumer can purchase. Thus, if the price of housing increases, the budget constraint will rotate towards the horizontal axis. This is shown in Figure 2 below.<\/p>\n<p>The other three budget constraints represent successively higher prices for housing of P<sub>1<\/sub>, P<sub>2<\/sub>, and P<sub>3<\/sub>. As the budget constraint rotates in, and in, and in again, we label the utility-maximizing choices M<sub>1<\/sub>, M<sub>2<\/sub>, and M<sub>3<\/sub>, and the quantity demanded of housing falls from Q<sub>0<\/sub>\u00a0to Q<sub>1<\/sub>\u00a0to Q<sub>2<\/sub>\u00a0to Q<sub>3<\/sub>.<\/p>\n<div id=\"attachment_6660\" style=\"width: 400px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6660\" class=\"wp-image-6660 size-full\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/2042\/2018\/02\/08204236\/CNX_Econ_C06_0041.jpg\" alt=\"The two graphs show how budget constraints influence the demand curve.\" width=\"390\" height=\"610\" \/><\/p>\n<p id=\"caption-attachment-6660\" class=\"wp-caption-text\"><strong>Figure 2.<\/strong>\u00a0<strong>From Budget Constraint to Demand Curve.<\/strong> (a) As the price increases from P<sub>0<\/sub> to P<sub>1<\/sub> to P<sub>2<\/sub> to P<sub>3<\/sub>, the budget constraint on the upper part of the diagram rotates clockwise. The utility-maximizing choice changes from M<sub>0<\/sub> to M<sub>1<\/sub> to M<sub>2<\/sub> to M<sub>3<\/sub>. As a result, the quantity demanded of housing shifts from Q<sub>0<\/sub> to Q<sub>1<\/sub> to Q<sub>2<\/sub> to Q<sub>3<\/sub>, ceteris paribus. (b) The demand curve graphs each combination of the price of housing and the quantity of housing demanded, ceteris paribus. The quantities of housing are the same at the points on both (a) and (b). Thus, the original price of housing (P<sub>0<\/sub>) and the original quantity of housing (Q<sub>0<\/sub>) appear on the demand curve as point E<sub>0<\/sub>. The higher price of housing (P<sub>1<\/sub>) and the corresponding lower quantity demanded of housing (Q<sub>1<\/sub>) appear on the demand curve as point E<sub>1<\/sub>.<\/p>\n<\/div>\n<p>So, as the price of housing rises, the budget constraint rotates clockwise (inward), and the quantity consumed of housing falls, <span class=\"emphasis\"><em>ceteris paribus<\/em><\/span> (meaning, with all other things being the same). This relationship\u2014the price of housing rising from P<sub>0<\/sub> to P<sub>1<\/sub> to P<sub>2<\/sub> to P<sub>3<\/sub>, while the quantity of housing demanded falls from Q<sub>0<\/sub> to Q<sub>1<\/sub> to Q<sub>2<\/sub> to Q<sub>3<\/sub>\u2014is graphed on the demand curve in Figure 2(b). Indeed, the vertical dashed lines stretching between the top and bottom of Figure 1 show that the quantity of housing demanded at each point is the same in both (a) and (b). Thus, the shape of a demand curve is ultimately determined by the underlying choices about maximizing utility subject to a budget constraint. And while economists may not be able to measure &#8220;utils,&#8221; they can certainly measure price and quantity demanded.<\/p>\n<h2><span class=\"cnx-gentext-section cnx-gentext-t\">Applications in Government and Business\u00a0<\/span><\/h2>\n<p>The budget constraint framework for making utility-maximizing choices offers a reminder that people can react to a change in price or income in a range of different ways. For example, in the winter months of 2005, costs for heating homes increased significantly in many parts of the country as prices for natural gas and electricity soared, due in large part to the disruption caused by Hurricanes Katrina and Rita. Some people reacted by reducing the quantity demanded of energy; for example, by turning down the thermostats in their homes by a few degrees and wearing a heavier sweater inside. Even so, many home heating bills rose, so people adjusted their consumption in other ways, too. As you learned in the module on <span style=\"color: #333333;\">E<\/span>lasticity, the short run demand for home heating is generally inelastic. Each household cut back on what it valued least on the margin; for some it might have been some dinners out, or a vacation, or postponing buying a new refrigerator or a new car. Indeed, sharply higher energy prices can have effects beyond the energy market, leading to a widespread reduction in purchasing throughout the rest of the economy.<\/p>\n<p>A similar issue arises when the government imposes taxes on certain products, like it does on gasoline, cigarettes, and alcohol. Say that a tax on alcohol leads to a higher price at the liquor store, the higher price of alcohol causes the budget constraint to pivot left, and consumption of alcoholic beverages is likely to decrease. However, people may also react to the higher price of alcoholic beverages by cutting back on other purchases. For example, they might cut back on snacks at restaurants like chicken wings and nachos. It would be unwise to assume that the liquor industry is the only one affected by the tax on alcoholic beverages.<\/p>\n<div class=\"textbox key-takeaways\">\n<h3><strong>Does it make a difference who controls household income?<\/strong><\/h3>\n<p>In the mid-1970s, the United Kingdom made an interesting policy change in its &#8220;child allowance&#8221; policy. This program provides a fixed amount of money per child to every family, regardless of family income. Traditionally, the child allowance had been distributed to families by withholding less in taxes from the paycheck of the family wage earner\u2014typically the father in this time period. The new policy instead provided the child allowance as a cash payment to the mother. As a result of this change, households have the same level of income and face the same prices in the market, but the money is more likely to be in the purse of the mother than in the wallet of the father.<\/p>\n<p>Should this change in policy alter household consumption patterns? Basic models of consumption decisions, of the sort examined in this module, assume that it does not matter whether the mother or the father receives the money, because both parents seek to maximize the utility of the family as a whole. In effect, this model assumes that everyone in the family has the same preferences.<\/p>\n<p>In reality, the share of income controlled by the father or the mother does affect what the household consumes. When the mother controls a larger share of family income a number of studies, in the United Kingdom and in a wide variety of other countries, have found that the family tends to spend more on restaurant meals, child care, and women&#8217;s clothing, and less on alcohol and tobacco. As the mother controls a larger share of household resources, children&#8217;s health improves, too. These findings suggest that when providing assistance to poor families, in high-income countries and low-income countries alike, the monetary amount of assistance is not all that matters: it also matters which member of the family actually receives the money.<\/p>\n<\/div>\n<p>The budget constraint framework serves as a constant reminder to think about the full range of effects that can arise from changes in income or price, not just effects on the one product that might seem most immediately affected.<\/p>\n<div class=\"textbox tryit\">\n<h3>Try It<\/h3>\n<p>\t<iframe id=\"lumen_assessment_7964\" class=\"resizable\" src=\"https:\/\/assessments.lumenlearning.com\/assessments\/load?assessment_id=7964&#38;embed=1&#38;external_user_id=&#38;external_context_id=&#38;iframe_resize_id=lumen_assessment_7964\" frameborder=\"0\" style=\"border:none;width:100%;height:100%;min-height:400px;\"><br \/>\n\t<\/iframe><\/p>\n<p>\t<iframe id=\"lumen_assessment_7965\" class=\"resizable\" src=\"https:\/\/assessments.lumenlearning.com\/assessments\/load?assessment_id=7965&#38;embed=1&#38;external_user_id=&#38;external_context_id=&#38;iframe_resize_id=lumen_assessment_7965\" frameborder=\"0\" style=\"border:none;width:100%;height:100%;min-height:400px;\"><br \/>\n\t<\/iframe><\/p>\n<\/div>\n<p>\t<iframe id=\"lumen_assessment_7775\" class=\"resizable\" src=\"https:\/\/assessments.lumenlearning.com\/assessments\/load?assessment_id=7775&#38;embed=1&#38;external_user_id=&#38;external_context_id=&#38;iframe_resize_id=lumen_assessment_7775\" frameborder=\"0\" style=\"border:none;width:100%;height:100%;min-height:400px;\"><br \/>\n\t<\/iframe><\/p>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-6384\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>How Changes in Income and Prices Affect Consumption Choices. <strong>Authored by<\/strong>: OpenStax College. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"https:\/\/cnx.org\/contents\/vEmOH-_p@4.17:cCMVAG8i@4\/How-Changes-in-Income-and-Pric\">https:\/\/cnx.org\/contents\/vEmOH-_p@4.17:cCMVAG8i@4\/How-Changes-in-Income-and-Pric<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em>. <strong>License Terms<\/strong>: Download for free at http:\/\/cnx.org\/contents\/bc498e1f-efe9-43a0-8dea-d3569ad09a82@4.4<\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section>","protected":false},"author":29,"menu_order":7,"template":"","meta":{"_candela_citation":"[{\"type\":\"cc\",\"description\":\"How Changes in Income and Prices Affect Consumption Choices\",\"author\":\"OpenStax 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