1 In this chapter, look for the answers to these questions: What determines a competitive firm’s demand for labor?How does labor supply depend on the wage? What other factors affect labor supply?How do various events affect the equilibrium wage and employment of labor?How are the equilibrium prices and quantities of other inputs determined?
2 Varied Markets Labor Markets Labor market Job collection of people and firms who are trading labor servicesJobcontract between a firm and a household to provide labor services
3 Varied Markets Financial Markets Capital Financial capital tools, instruments, machines, and other constructions that have been produced in the past and that businesses use to produce goods and servicesFinancial capitalfunds that firms use to buy and operate physical capital
4 Varied Markets (Financial cont.) Financial MarketA collection of people and firms who are lending and borrowing to finance the purchase of physical capital.The two main types of financial market areStock marketBond market
5 Varied Markets Stock Market market in which the shares in the stocks of companies are tradedExamples: New York Stock Exchange, NASDAQ
6 Varied Markets Bond Market Bond market in which bonds issued by firms or governments are tradedBondpromise to pay specified sums of money on specified date
7 Anatomy of Factor Markets Land Marketsland consists of all the gifts of naturemarket in which raw materials are traded are called a commodity marketCompetitive Factor Marketsmost factor markets have many buyers and sellers and are competitive markets
8 Factors of Production and Factor Markets Factors of Production and Factor MarketsFactors of production: inputs used to produce goods and servicesLaborLandCapital: equipment and structures used to produce goods and servicesprices and quantities of these inputs are determined by supply & demand in factor markets
10 Derived DemandMarkets for the factors of production are like markets for goods & services, except:Demand for a factor of production is a derived demandderived from a firm’s decision to supply a good in another market
11 The Versatility of Supply and Demand (a) The Market for Apples(b) The Market for Apple PickersPrice ofWage ofApplesApplePickersDemandDemandSupplySupplyPQLWQuantity ofQuantity ofApplesApple PickersThe apple producer’s demand for apple pickers is derived from the market demand for apples.
12 Two Assumptions 1. We assume all markets are competitive. Two Assumptions1. We assume all markets are competitive.The typical firm is a price takerin the market for the product it producesin the labor market2. We assume that firms care only about maximizing profitsEach firm’s supply of output and demand for inputs are derived from this goal
13 Our Example: Farmer Jack Our Example: Farmer JackFarmer Jack sells wheat in a perfectly competitive marketHe hires workers in a perfectly competitive labor marketWhen deciding how many workers to hire, Farmer Jack maximizes profits by thinking at the margin:If the benefit from hiring another worker exceeds the cost, Jack will hire that worker
14 Our Example: Farmer Jack Our Example: Farmer JackCost of hiring another worker: the wage – the price of laborBenefit of hiring another worker: Jack can produce more wheat to sell, increasing his revenuesize of this benefit depends on Jack’s production function: the relationship between the quantity of inputs used to make a good and the quantity of output of that good
15 Farmer Jack’s Production Function 5001,0001,5002,0002,5003,00012345No. of workersQuantity of outputQ (bushels of wheat per week)L (no. of workers)1000118002240032800430005
16 Marginal Product of Labor (MPL) Marginal product of labor: the increase in the amount of output from an additional unit of laborwhere ∆Q = change in output ∆L = change in labor∆Q∆LMPL =
17 The Value of the Marginal Product Problem:cost of hiring another worker (wage) is measured in dollarsbenefit of hiring another worker (MPL) is measured in units of outputSolution: convert MPL to dollarsValue of the marginal product: the marginal product of an input times the price of the outputVMPL = value of the marginal product of labor = P x MPL
18 The Value of the Marginal Product VMPL = value of the marginal product of labor = P x MPLSometimes referred to as Marginal Revenue Product or MRP.
19 A C T I V E L E A R N I N G 1: Computing MPL and VMPL P = $5/bushel.Find MPL and VMPL, fill them in the blank spaces of the table.Then graph a curve with VMPL on the vertical axis, L on horiz axis.L(no. of workers)Q(bushels of wheat)MPLVMPL1100021800324004280053000
20 A C T I V E L E A R N I N G 1: Answers Farmer Jack’s production function exhibits diminishing marginal product:MPL falls as L increases.This property is very common.L(no. of workers)Q(bushels of wheat)MPL = ∆Q/∆LVMPL = P x MPL1000$5,000110008004,000218006003,000324004002,000428002001,00053000
21 A C T I V E L E A R N I N G 1: Answers The VMPL curve1,0002,0003,0004,0005,000$6,000Farmer Jack’s VMPL curve is downward sloping, due to diminishing marginal product.12345L (number of workers)
22 Farmer Jack’s Labor Demand The VMPL curveSuppose wage W = $2500/week.How many workers should Jack hire?Answer: L = 31,0002,0003,0004,0005,000$6,000$2,500At any larger L, can increase profit by hiring one fewer worker.At any smaller L, can increase profit by hiring another worker.12345L (number of workers)
23 VMPL and Labor Demand For any competitive, profit-maximizing firm: VMPL and Labor DemandFor any competitive, profit-maximizing firm:To maximize profits, hire workers up to the point where VMPL = W.The VMPL curve is the labor demand curve.WLVMPLW1L1
24 Demand for a factor of production The first two columns of the table are the firm’s total product schedule.To calculate marginal product, find the change in total product as the quantity of labor increases by 1 worker.
25 Demand for a factor of production To calculate the value of marginal product, multiply the marginal product numbers by the price of a car wash, which in this example is $3.
27 Demand for a factor of production Previously we viewed the value of the marginal product at Max’s Wash ’n’ Wax.The blue bars show the value of the marginal product of the labor that Max hires based on the numbers in the table.
28 The orange line is the firm’s value of the marginal product of labor curve.
29 Recall from previous slides A Firm’s Demand for Laborfirm hires labor up to the point at which the value of marginal product equals the wage rateif value of marginal product of labor exceeds the wage rate, a firm can increase its profit by employing one more workerif wage rate exceeds the value of marginal product of labor, a firm can increase its profit by employing one fewer worker
30 This graph shows the demand for labor at Max’s Wash’n’ Wax. At a wage rate of $10.50 an hour, Max makes a profit on the first 2 workers but would incur a loss on the third worker.
31 The demand for labor curve slopes downward because the value of the marginal product of labor diminishes as the quantity of labor employed increases.
32 The Marginal Revenue Product of Labor The Relationship between the Marginal Revenue Product of Labor and the WageWHEN …THEN THE FIRM …MRP > W,should hire more workers to increase profits.MRP < W,should hire fewer workers to increase profits.MRP = W,is hiring the optimal number of workers and is maximizing profits.
33 Shifts in Labor Demand Labor demand curve = VMPL curve. VMPL = P x MPL Labor demand curve = VMPL curve.VMPL = P x MPLAnything that increases P or MPL at each L will increase VMPL and shift labor demand curve upward.WLD2D1
34 Things that Shift the Labor Demand Curve Things that Shift the Labor Demand CurveChanges in the output price, PTechnological change (affects MPL)The supply of other factors (affects MPL)Example: If firm gets more equipment (capital), then workers will be more productive; MPL and VMPL rise, labor demand shifts upward
35 The Connection Between Input Demand & Output Supply Recall: marginal cost (MC)= cost of producing an additional unit of output= ∆TC/∆Q, where TC = total costSuppose W = $2500, MPL = 500 bushelsIf Farmer Jack hires another worker, ∆TC = $2500, ∆Q = 500 bushelsMC = $2500/500 = $5 per bushelIn general: MC = W/MPL
36 The Connection Between Input Demand & Output Supply In general: MC = W/MPLNotice:To produce additional output, hire more laborAs L rises, MPL fallscausing W/MPL to risecausing MC to riseHence, diminishing marginal product and increasing marginal cost are two sides of the same coin
37 The Connection Between Input Demand & Output Supply The competitive firm’s rule for demanding labor: P x MPL = WDivide both sides by MPL: P = W/MPLSubstitute MC = W/MPL from previous slide: P = MCthis is the competitive firm’s rule for supplying outputHence, input demand and output supply are two sides of the same coin
38 Labor SupplyPeople face trade-offs, including a trade-off between work and leisure: --the more time you spend working, the less time you have for leisure.The cost of something is what you give up to get it. The opportunity cost of leisure is the wage.
39 The Labor Supply CurveAn increase in W is an increase in the opp. cost of leisure.People respond by taking less leisure and by working more.WLS1W2L2W1L1
40 Things that Shift the Labor Supply Curve Things that Shift the Labor Supply Curvechanges in tastes or attitudes regarding the labor-leisure trade-offopportunities for workers in other labor marketsimmigration
41 Equilibrium in the Labor Market The wage adjusts to balance supply and demand for labor.The wage always equals VMPL.WLSDW1L1
42 A C T I V E L E A R N I N G 2: Changes in labor-market equilibrium In each of the following scenarios, use a diagram of the market for auto workers to find the effects on the wage and number of auto workers employed.A. Baby Boomers in the auto industry retire.B. Widespread recalls of U.S. autos shift car buyers’ demand toward imported autos.C. Technological progress boosts productivity in the auto manufacturing industry.
43 A C T I V E L E A R N I N G 2A: Answers The market for autoworkersThe retirement of Baby Boomer auto workers shifts supply leftward.W rises, L falls.WLS2S1D1W2L2W1L1
44 A C T I V E L E A R N I N G 2B: Answers The market for autoworkersA fall in the demand for U.S. autos reduces P.At each L, VMPL falls.Labor demand curve shifts down.W and L both fall.WLS1D1D2W1L1W2L2
45 A C T I V E L E A R N I N G 2C: Answers The market for autoworkersAt each L, MPL rises due to tech. progress.VMPL rises and labor demand curve shifts upward.W and L increase.WLD2S1D1W2L2W1L1
46 Productivity and Wage Growth in the U.S. A country’s standard of living depends on its ability to produce g&s.Our theory implies wages tied to labor productivity (W = VMPL).We see this in the data.time periodgrowth rate of produc-tivitygrowth rate of real wages2.1%2.0%18.104.22.168.23.03.0
47 The Other Factors of Production The Other Factors of ProductionWith land and capital, must distinguish between:purchase price – the price a person pays to own that factor indefinitelyrental price – the price a person pays to use that factor for a limited period of timewage is the rental price of laborThe determination of the rental prices of capital and land is analogous to the determination of wages…
48 How the Rental Price of Land Is Determined The market for landFirms decide how much land to rent by comparing the price with the value of the marginal product (VMP) of land.The rental price of land adjusts to balance supply and demand for land.PQSD = VMPPQ
49 How the Rental Price of Capital Is Determined The market for capitalFirms decide how much capital to rent by comparing the price with the value of the marginal product (VMP) of capital.The rental price of capital adjusts to balance supply and demand for capital.PQSD = VMPPQ
50 Rental and Purchase Prices Rental and Purchase PricesBuying a unit of capital or land yields a stream of rental incomerental income in any period equals the value of the marginal product (VMP)Hence, equilibrium purchase price of a factor depends on both the current VMP and the VMP expected to prevail in future periods
51 Linkages Among the Factors of Production In most cases, factors of production are used together in a way that makes each factor’s productivity dependent on the quantities of the other factorsExample: an increase in the quantity of capitalThe marginal product and rental price of capital fallHaving more capital makes workers more productive, MPL and W rise
52 Markets for LaborHow does a college degree affect future earning?
53 Equilibrium in the Labor Market The Effect on Equilibrium Wages of a Shift in Labor Supply
54 Labor and the Great Immigrations In the early 20th century, wages rose as technological change increased the demand for labor enough to offset the increase in labor supply resulting from immigration.
55 Differences in WagesBaseball players are paid more than college professors.
56 Explaining Differences in Wages Compensating DifferentialsHigher wages that compensate workers for unpleasant aspects of a jobDiscrimination (Economic)Paying a person a lower wage or excluding a person from an occupation on the basis of an irrelevant characteristic such as race or gender
57 Non-perfectly competitive labor Markets MonopsonyFirm is a price maker and has the power to affect wages
58 CONCLUSIONThe theory in this chapter is called the neoclassical theory of income distributionIt states thatfactor prices determined by supply and demandeach factor is paid the value of its marginal productMost economists use this theory a starting point for understanding the distribution of income.
59 CHAPTER SUMMARYThe economy’s income distribution is determined in the markets for the factors of production. The three most important factors of production are labor, land, and capital.A firm’s demand for a factor is derived from its supply of output.Competitive firms maximize profit by hiring each factor up to the point where the value of its marginal product equals its rental price.
60 CHAPTER SUMMARYThe supply of labor arises from the trade-off between work and leisure, and yields an upward-sloping labor supply curve.The price paid to each factor adjusts to balance supply and demand for that factor. In equilibrium, each factor is compensated according to its marginal contribution to production.Factors of production are used together. A change in the quantity of one factor affects the marginal products and equilibrium earnings of all factors.
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