2 Objectives After studying this chapter, you will able to Explain how housing markets work and how price ceilings create housing shortages and inefficiencyExplain how labor markets work and how minimum wage laws create unemployment and inefficiencyExplain the effects of the sales taxExplain why farm prices and farm revenues fluctuate and how production subsidies and quotas influence farm production, costs, and pricesExplain how markets for illegal goods work
3 Turbulent Times混亂時刻As more people compete for scarce land, house prices and rents rise.As new technologies replace low-skilled labor, the demand for low-skilled workers falls.Can governments control prices and wages?How do taxes affect prices and quantities, and who pays the tax, the buyer or the seller?How are farm prices and incomes affected by fluctuations in harvests?What happens in a market when trading a good is illegal?Economics opens our eyes! This chapter is a reward to the students for mastering the three preceding chapters—demand and supply, elasticity, and efficiency and equity. And the chapter provides you with an opportunity to “sell” economics as a highly valuable perspective on the world.Milton Friedman (quoted in Parkin, Economics, first edition, 1990, p. 99) said: “I always say that we economists may not know much, be we know one thing very well, and that’s how to create shortages and surpluses. Just tell us which you want! If you want a shortage, all we have to do is to set a price that’s below the market price and I’ll guarantee you a shortage. If you want a surplus, set the price too high and you’ll have your surplus.”Show the students how much they have learned in just a few chapters and how the demand and supply model enables them to understand complex events that affect their daily lives.Use to full advantage of the fact that issues like apartment rents and relationships with landlords are relevant to their lives and demand and supply models can reveal how the actions of others influence their decisions.Get them to consider how their response to the minimum wage laws are motivating them to act in a way which influences the lives of poor workers in the world of unskilled labor (see additional discussion questions, below).Let them see how they can become a better citizen-voter through the insights they can gain from this introduction to tax analysis.
4 Housing Markets and Rent Ceilings 住宅市場與租金上限The 1906 earthquake in San Francisco left 200,000 people—more than half the city—homeless.By the time the San Francisco Chronicle started publishing again, a month after the earthquake, there was not a single mention of a housing shortage.The classified advertisements listed many more houses and flats for rent than the advertisements for houses and flats wanted.How did the market achieve this outcome?
5 Housing Markets and Rent Ceilings 住宅市場與租金上限The Market Response to a Decrease in SupplyFigure 6.1 shows the San Francisco housing market before the earthquake.The quantity of housing was 100,000 units and the rent was $16 a month at the intersection of D and SS.Time and the elasticity of supply. Get the students to recall the different influences on the supply elasticity of the firm from Chapter 4 and remind them how the luxury of time allows sellers to fully respond to changes in their environment.Explain why it is likely that supply is perfectly elastic in the long run for many goods and services.
6 Housing Markets and Rent Ceilings 住宅市場與租金上限The earthquake decreased the supply of housing and the supply curve shifted leftward to SSA.The rent increased to $20 a month and the quantity decreased to 72,000 units.
7 Housing Markets and Rent Ceilings 住宅市場與租金上限Long-Run AdjustmentsThe long-run supply of housing is perfectly elastic at $16 a month.With the rent above $16 a month, new houses and apartments are built.
8 Housing Markets and Rent Ceilings 住宅市場與租金上限The building program increases supply and the supply curve shifts rightward.The quantity of housing increases and the rent falls to the pre-earthquake levels (other things remaining the same).
9 Housing Markets and Rent Ceilings 住宅市場與租金上限A Regulated Housing Market 住宅市場的管制A price ceiling is a regulation that makes it illegal to charge a price higher than a specified level.When a price ceiling is applied to a housing market it is called a rent ceiling.If the rent ceiling is set above the equilibrium rent, it has no effect. The market works as if there were no ceiling.But if the rent ceiling is set below the equilibrium rent, it has powerful effects.
10 Housing Markets and Rent Ceilings 住宅市場與租金上限Figure 6.2 shows the effects of a rent ceiling that is set below the equilibrium rent.The equilibrium rent is $20 a month.A rent ceiling is set at $16 a month.So the equilibrium rent is in the illegal region.
11 Housing Markets and Rent Ceilings 住宅市場與租金上限At the rent ceiling, the quantity of housing demanded exceeds the quantity supplied and there is a housing shortage.Explain that because landlords can’t be forced to supply a greater quantity than they wish, the quantity of housing supplied at the rent ceiling is less than the quantity that would be supplied in an unregulated market.
12 Housing Markets and Rent Ceilings 住宅市場與租金上限With a housing shortage, people are willing to pay $24 a month.Because the legal price cannot eliminate the shortage, other mechanisms operate:search activity尋找活動black markets黑市
13 Housing Markets and Rent Ceilings 住宅市場與租金上限Search ActivityThe time spent looking for someone with whom to do business is called search activity. 花時間在市場尋找交易的對方When a price is regulated and there is a shortage, search activity increases.Search activity is costly and the opportunity cost of housing equals its rent (regulated) plus the opportunity cost of the search activity (unregulated).Because the quantity of housing is less than the quantity in an unregulated market, the opportunity cost of housing exceeds the unregulated rent.尋找活動
14 Housing Markets and Rent Ceilings 住宅市場與租金上限Black Markets 黑市A black market is an illegal market that operates alongside a legal market in which a price ceiling or other restriction has been imposed.一個價格超過合法上限的非法交易市場A shortage of housing creates a black market in housing.Illegal arrangements are made between renters and landlords at rents above the rent ceiling—and generally above what the rent would have been in an unregulated market.
15 Housing Markets and Rent Ceilings 住宅市場與租金上限Inefficiency of Rent Ceilings 租金上限的無效率A rent ceiling leads to an inefficient use of resources.The quantity of rental housing is less than the efficient quantity and there is a deadweight loss, illustrated in Figure 6.3 (page 125).
16 Housing Markets and Rent Ceilings 住宅市場與租金上限Inefficiency of Rent CeilingsA rent ceiling leads to an inefficient use of resources.The quantity of rental housing is less than the efficient quantity and there is a deadweight loss.Figure 6.3 illustrates this loss.
17 Housing Markets and Rent Ceilings 住宅市場與租金上限A rent ceiling decreases the quantity of rental housing,shrinks the producer and consumer surplus by using resources is search activity,and creates a deadweight loss.
18 Housing Markets and Rent Ceilings 住宅市場與租金上限Are Rent Ceilings FairAccording to the fair rules view, a rent ceiling is unfair because it blocks voluntary exchange.According to the fair results view, a rent ceiling is unfair because it does not generally benefit the poor.
19 The Labor Market and the Minimum Wage 勞動市場與最低工資率New, labor-saving technologies become available every year, which mainly replace low-skilled labor.Does the persistent decrease in the demand for low-skilled labor depress the wage rates of these workers?The immediate effect of these technological advances is a decrease in the demand for low-skill labor, a fall in the wage rate, and a decrease in the quantity of labor supplied.Figure 6.4 on the next slide illustrates this immediate effect.Labor is work that households supply and firms demand. You might be surprised to find that quite a few students think that the demand for labor is the demand by a household for a job and the supply of labor is the supply of jobs by firms. Of course, they get into a big mess with this mirror image view of the labor market. Try to avoid this all-too-common mistake by being very explicit that labor is work. Households supply it and firms demand it. Sure, firms provide jobs and people want jobs to earn an income. But it is labor, not jobs, that is supplied and demanded in the labor market.
20 The Labor Market and the Minimum Wage 勞動市場與最低工資率A decrease in the demand for low-skill labor is shown by a leftward shift of the demand curve.A new labor market equilibrium arises at a lower wage rate and a smaller quantity of labor employed.Time and the elasticity of labor supply. It is easy to get the students to see that the supply of labor can adjust more in the long run than in the short run. This fact is central to understanding why technological change doesn’t bring a permanent fall in the wage rates of low-skilled labor and why it does bring a transitory (but possibly lengthy fall).
21 The Labor Market and the Minimum Wage 勞動市場與最低工資率In the long run, people get trained to do higher-skilled jobs.The supply of low-skill labor decreases, which is shown by a leftward shift of the short-run supply curve.
22 The Labor Market and the Minimum Wage 勞動市場與最低工資率低技術勞動供需市場If long-run supply is perfectly elastic, the equilibrium wage rate returns to its initial level (other things remaining the same).技術進步的衝擊過後,長期調整下的均衡,低技術勞動工資回復原來長期均衡水準,低技術勞動僱用量減少
23 The Labor Market and the Minimum Wage 勞動市場與最低工資率A Minimum WageA price floor is a regulation that makes it illegal to trade at a price lower than a specified level.When a price floor is applied to labor markets, it is called a minimum wage.If the minimum wage is set below the equilibrium wage rate, it has no effect. The market works as if there were no minimum wage.If the minimum wage is set above the equilibrium wage rate, it has powerful effects.
24 The Labor Market and the Minimum Wage 勞動市場與最低工資率If the minimum wage is set above the equilibrium wage rate, the quantity of labor supplied by workers exceeds the quantity demanded by employers. There is a surplus of labor.Because employers cannot be forced to hire a greater quantity than they wish, the quantity of labor hired at the minimum wage is less than the quantity that would be hired in an unregulated labor market.Because the legal wage rate cannot eliminate the surplus, the minimum wage creates unemploymentFigure 6.5 on the next slide illustrates these effects.
25 The Labor Market and the Minimum Wage 勞動市場與最低工資率The equilibrium wage rate is $4 an hour.The minimum wage rate is set at $5 an hour.So the equilibrium wage rate is in the illegal region.
26 The Labor Market and the Minimum Wage 勞動市場與最低工資率The quantity of labor employed is the quantity demanded.The quantity of labor supplied exceeds the quantity demanded.Unemployment is the gap between the quantity demanded and the quantity supplied.
27 The Labor Market and the Minimum Wage 勞動市場與最低工資率Inefficiency of a Minimum Wage 最低工資的不效率A minimum wage leads to an inefficient use of resources.The quantity of labor employed is less than the efficient quantity and there is a deadweight loss.Figure 6.6 illustrates this loss.
28 The Labor Market and the Minimum Wage 勞動市場與最低工資率A minimum wage decreases the quantity of labor employed,shrinks the firms’ and workers’ surplus by using resources in job search activity,and creates a deadweight loss.
29 The Labor Market and the Minimum Wage 勞動市場與最低工資率The Federal Minimum Wage and its EffectsThe United States has passed the Fair Standards Labor Act, which currently sets the minimum wage at $5.15 per hour.This minimum wage has historically fluctuated between 35 percent and 50 percent of the average wage of production workers.Most economists believe that minimum wage laws increase the unemployment rate of low-skilled younger workers.Talk about the study of wage and employment data by David Card and Alan Krueger (Myth and Measurement: The New Economics of the Minimum Wage Law, Princeton: Princeton University Press, 1995), which suggests that minimum wage laws do not cause unemployment.Note that other economists disagree and claim that ceteris paribus conditions were violated regarding:the timing of hiring decisionsregional differences
30 The Labor Market and the Minimum Wage A Living Wage 夠維持生活的工資A living wage has been defined as an hourly wage rate that enables a person who works a 40 hour week to rent adequate housing for not more than 30 percent of the amount earned.Living wage laws operate in St Louis, St Paul, Minneapolis, Boston, Oakland, Denver, Chicago, New Orleans, and New York City.The effects of a living wage are similar to those of a minimum wage.Do a Google search for “living wage” and you’ll come up with a lot of stuff, much of it very current. This topic generates a spirited classroom discussion.
31 Taxes 課稅 Everything you earn and most things you buy are taxed. Who really pays these taxes?
32 Taxes 課稅 課稅的歸宿 Tax Incidence Tax incidence is the division of the burden of a tax between the buyer and the seller.When an item is taxed, its price might rise by the full amount of the tax, by a lesser amount, or not at all.If the price rises by the full amount of the tax, the buyer pays the tax.If the price rise by a lesser amount than the tax, the buyer and seller share the burden of the tax.If the price doesn’t rise at all, the seller pays the tax.課稅的歸宿
33 Taxes 課稅 Tax Incidence Tax incidence doesn’t depend on tax law! The law might impose a tax on the buyer or the seller, but the outcome will be the same.To see why, we look at the tax on cigarettes in New York City.On July 1, 2002, Mayor Bloomberg upped the cigarette tax in New York City from almost nothing to $1.50 a pack.
34 Taxes 課稅 A tax on sellers of $1.50 a pack is introduced. Figure 6.7 shows the effects of this tax.With no tax, the equilibrium price is $3 a pack.A tax on sellers of $1.50 a pack is introduced.The curve S + tax on seller shows the new supply curve.
35 Taxes課稅The vertical distance between the original supply curve and the supply curve with the tax is equal to the amount of the tax--$1.50.Buyers would have to pay $4.50 a pack to induce firms to offer the original quantity for sale.
36 Taxes 課稅 The tax changes the equilibrium price and quantity. The quantity decreases.The price paid by the buyer rises to $4 and the price received by the seller falls to $2.50.So buyers pay $1 of the tax.Sellers pay the remaining 50¢.
37 Taxes 課稅 A Tax on Buyers 對買方課稅 Now suppose that buyers, not sellers, are taxed $1.50 a pack.Again, with no tax, the equilibrium price is $3 a pack.A tax on buyers of $1.50 a pack is introduced.The curve D - tax on buyer shows the new demand curve.
38 Taxes The tax changes the equilibrium price and quantity. The quantity decreases.The price paid by the buyer rises to $4 and the price received by the seller falls to $2.50.
39 So, exactly as before when the seller was taxed: The buyer pays $1 of the tax.The seller pays the other 50¢ of the tax.Tax incidence is the same regardless of whether the law says the seller pays or the buyer pays.
40 TaxesThe division of the tax between the buyer and the seller depends on the elasticities of demand and supply.Tax Division and Elasticity of DemandTo see the effect of the elasticity of demand on the division of the tax payment, we look at two extreme cases.Perfectly inelastic demand: the buyer pays the entire tax.Perfectly elastic demand: the seller pays the entire tax.The more inelastic the demand, the larger is the buyers’ share of the tax.
41 TaxesIn this figure, demand is perfectly inelastic—the demand curve is vertical.When a tax is imposed on this good, the buyer pays the entire tax.
42 TaxesIn this figure, demand is perfectly elastic—the demand curve is horizontal.When a tax is imposed on this good, the seller pays the entire tax.
43 Taxes Tax Division and Elasticity of Supply To see the effect of the elasticity of supply on the division of the tax payment, we again look at two extreme cases.Perfectly inelastic supply: the seller pays the entire tax.Perfectly elastic supply: the buyer pays the entire tax.The more elastic the supply, the larger is the buyers’ share of the tax.
44 TaxesIn this figure, supply is perfectly inelastic—the supply curve is vertical.When a tax is imposed on this good, the seller pays the entire tax.
45 TaxesIn this figure, supply is perfectly elastic—the supply curve is horizontal.When a tax is imposed on this good, the buyer pays the entire tax.
46 Taxes Taxes in Practice (銷售)稅的執行 Taxes usually are levied on goods and services with an inelastic demand or an inelastic supply.Alcohol, tobacco, and gasoline have inelastic demand, so the buyers of these items pay most the tax on them.Labor has a low elasticity of supply, so the seller—the worker—pays most of the income tax and most of the Social Security tax.Taxes and the inelasticity of “sinful” acts. If students understand the basics of taxes, they will become more informed citizen voters. Raise a number of provocative issues related to taxation to evoke student interest in understanding why some goods are taxed and others are not.Taxing the consumer surplus of smokers—“Once, Twice Three times a levy.” Provoke the students’ interest in tax policy by showing them how cigarette smokers are “taxed” at least three times for their habit:Many believe that smoking is considered to be one of the most addictive, legally available products in the market without a doctor’s prescription. The government recognizes demand for cigarettes is highly inelastic and places a hefty sales tax on each pack of cigarettes. Strike one.Many state governments have sued the major tobacco companies for compensation for past and future health care costs arising from the smoking-related illnesses of its citizens. Tobacco companies have recently settled these suits by paying hundreds of billions of dollars in penalties. Students should see that inelastic demand for cigarettes allows tobacco producers to pass on most of these costs to the smoker. (This could explain why the settlement has done little in the long run to depress the stock prices and dividends from these major tobacco companies, relative to the whole market.) Strike two.Due to the increased health risk of smoking, the average smoker dies at a much earlier age than the average non-smoker. This means that smokers can expect to receive little, if any, return on all the social security taxes they’ve been paying in throughout their lives. (That is, assuming any of us will get anything back for our social security taxes!) Strike three!
47 Taxes Taxes and Efficiency Except in the extreme cases of perfectly inelastic demand or supply when the quantity remains the same, imposing a tax creates inefficiency.Figure 6.11 shows the inefficiency created by a $10 tax on CD players.
48 TaxesWith no tax, the market is efficient and the sum of consumer surplus and producer surplus is maximized.A tax shifts the supply curve, decreases the equilibrium quantity, raises the price to the buyer, and lowers the price to the seller.
49 TaxesThe tax revenue takes part of the consumer surplus and producer surplus.The decreased quantity creates a deadweight loss.
50 Subsidies and Quotas 補貼與配額 Fluctuations in the weather bring big fluctuations in farm output.How do changes in farm output affect the prices of farm products and farm revenues?How might farmers be helped by intervention in markets for farm products?Two nice lessons here:First, inelastic demand means that total revenue fluctuates in the opposite direction to the price. The students know this result from Chapter 4 and the total revenue test. But to see its implication for farm incomes brings the point home and shows its relevance.Second, inventories change the outcome radically. When a good can be stored, it has a perfect substitute—a unit a moment later. Ignoring inventory carrying costs, the perfectly elastic supply at the expected price transforms the predictions. If you want to add the realism of inventory carrying costs, you’ll need a break in the supply curve and two perfectly elastic segments at each side of the break. The price at which the item will be taken into inventory equals the expected selling price minus the inventory carrying cost. The price at which the item will be sold from inventory is the expected price.
51 Stabilizing Farm Revenue 穩定農產品收入 Harvest FluctuationsFigure 6.12(a) shows the market for wheat.Once the crop is planted, supply is perfectly inelastic along the momentary supply curve MS0.The price is $4 a bushel and farm total revenue is $80 billion.
52 Stabilizing Farm Revenues穩定農產品收入 A poor harvest decreases supply.Farmers lose $20 billion of total revenue on the decreased quantity sold.But they gain $30 billion from the higher price.Because demand is inelastic, total revenue increases—to $90 billion.
53 Stabilizing Farm Revenues穩定農產品收入 Now a bumper harvest increases supply.Farmers lose $40 billion of total revenue on the original quantity because the price falls.They gain only $10 billion from the increased quantity.Because demand is inelastic, total revenue decreases—to $50 billion.
54 Stabilizing Farm Revenues穩定農產品收入 Intervention in markets for farm products takes two main forms:Subsidies 補貼Production quota 生產限額A subsidy is a payment made by the government to a producer.A production quota is an upper limit to the quantity of a good that may be produced during a specified period.
55 Stabilizing Farm Revenues穩定農產品收入 SubsidiesThe producers of peanuts, sugarbeets, milk, wheat, and many other farm products receive subsidies.Figure 6.13 shows how a subsidy works.With no subsidy, the price is $40 and the quantity is 40 million tons a year
56 Stabilizing Farm Revenues穩定農產品收入 SubsidiesA subsidy of $20 a ton is introduced.Marginal cost minus subsidy falls by $20 and the new supply curve is S – subsidy.The new equilibrium is at 60 million tons and $30 a ton.
57 Stabilizing Farm Revenues穩定農產品收入 SubsidiesThe equilibrium quantity increases.The equilibrium price falls.The farmer receives more on each ton sold--$50 a ton in this example.
58 Stabilizing Farm Revenues穩定農產品收入 Production Quotas生產限額The markets for sugarbeets, tobacco leaf, and cotton, among others, are regulated with production quotas.Figure 6.14 shows how a production quota works.With no quota, the price is $30 and the quantity is 60 million tons a year.
59 Stabilizing Farm Revenues穩定農產品收入 Production QuotasA production quota limits total production to 40 million tons a year.The equilibrium quantity decreases to this amount.The price rises to $50 a ton and marginal cost falls to $20 a ton.
60 Markets for Illegal Goods 非法財貨的市場 The U.S. government prohibits trade of some goods, such as illegal drugs.Yet, markets exist for illegal goods and services.How does the market for an illegal good work?A Free Market for Drugs 毒品的自由市場To see how the market for an illegal good works, we begin by looking at a free market and see the changes that occur when the good is made illegal.Students are always interested in this analysis. The major thing to achieve is an awareness that declaring an activity to be illegal must be backed up with incentives—penalties. And taxes can work as an alternative incentive to achieve an identical outcome in terms of price and quantity.This analysis is another good place to emphasize that the opportunity cost of something is the market price plus any other costs of buying.
61 Markets for Illegal Goods Figure 6.15 shows the market for a drug such as marijuana.The equilibrium is at point E.The price is PC and the quantity is QC.
62 Markets for Illegal Goods A Market for Illegal DrugsProhibiting transactions in a good or service raises the cost of such trading.If sellers (drug dealers) are penalized, we must add the cost of breaking the law to the minimum supply price.
63 Markets for Illegal Goods If the penalty on the seller is the amount HK, the quantity supplied at a market price of PC is QP.A new supply curve passes through point HThe new equilibrium is at point F. The price rises and the quantity decreases.
64 Markets for Illegal Goods Starting again at the equilibrium point E, suppose that buyers are penalized (and not sellers).Now, we must subtract the cost of breaking the law from the maximum price that the buyer is willing to pay.
65 Markets for Illegal Goods If the penalty on the buyer is the amount JH, the quantity demanded at a market price of PC is QP.A new demand curve passes through point H.The new equilibrium is at point G. The market price falls and the quantity decreases.
66 Markets for Illegal Goods Now suppose that both buyers and sellers are penalized for trading in the illegal drug.
67 Markets for Illegal Goods The new equilibrium is at point H.The quantity decreases to QP.The market price is PC.The buyer pays PB and the seller receives PS.
68 Markets for Illegal Goods Legalizing and Taxing Drugs 合法化與毒品的課稅An illegal good can be legalized and taxed.A high enough tax rate would decrease consumption to the level that occurs when trade is illegal.Arguments that extend beyond economics surround this choice.
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