lecture by: jacinto f. fabiosa fall 2005 the labor market
TRANSCRIPT
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Lecture by: Jacinto F. Fabiosa
Fall 2005
The Labor Market
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Product Markets
• Markets in which firms sell goods and services to households or other firms
• Products made from the economy’s resources
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Factor Markets
• Markets in which resources are sold to firms –Resources include
• Capital, land, labor, and natural resources
• Resources are sometimes called factors of production
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Product and Factor Markets
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Labor Markets in Particular
• Determining a worker’s wage rate– Groups of economic decision makers come
together in markets in order to trade– Each decision maker tries to maximize
something and faces constraints– Observe equilibrium price determined in those
markets– Explore how various changes affect that
equilibrium price
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Special Meaning
• The special meaning of the price in the labor market—the wage rate– Income people earn over their lifetime will
determine how they will be able to provide for themselves and their families
– Adds a special moral dimension to events in labor markets
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Defining a Labor Market
• How broadly or narrowly we define a market depends on the specific questions we wish to answer– Broadly defined markets may look at markets
that draw on labor from all over the world– Narrowly defined markets may look at markets
that draw on labor on a very localized level
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Competitive Labor Markets
• Market with many indistinguishable sellers of labor and many buyers
– Involves no barriers to entry or exit
– Perfectly competitive labor markets must satisfy three conditions
• Great many buyers (firms) and sellers (households) of labor in market
• All workers in market appear the same to firms• No barriers to entering or leaving labor market
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Firms in Labor Markets
• Sometimes firms that compete in the same product market also compete in the same labor markets, but– Some firms that compete in the same product market operate in
different labor markets– Some firms that operate in different product markets compete in
the same labor market
• The demand side of a labor market includes all firms hiring labor in that labor market– These firms may (but not necessarily) compete in the same
product market
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Derived Demand
• The demand for labor is a derived demand―it arises from, and will vary with—the demand for the firm’s output– The phrase “will vary with” is important
• The demand for labor by a firm will change whenever demand for the firm’s product changes
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Resource Demand: A General Rule
• Marginal approach to profit– Firm should take any action that adds more to its revenue than it adds to
its cost
• When we view firm as a buyer in a resource or factor market, we use same principle of marginal decision making– This time action under consideration is “increase employment of the
resource by another unit” – Rule becomes
• Increase employment of any resource whenever doing so adds more to revenue than it adds to cost
– To avoid confusion between decisions about resources and decisions about output, we don’t use terms “marginal revenue” and “marginal cost” when discussing factor markets
• To track changes on the revenue side, use term “marginal revenue product”
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Marginal Revenue Product (MRP)
• The change in firm’s total revenue divided by change in its employment of a resource
)( resource ofquantity in change
)( revenue total in change(MRP) Product Revenue Marginal
L
TR
When firm thinks about changing resource by one unit at a timeMRP is the change in the firm’s revenue when it employs one more unit of the resource
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Marginal Factor Cost (MFC)
• To track changes on the cost side, we use the term marginal factor cost
)( resource ofquantity in change
)( cost total in change(MFC) Cost Factor Marginal
L
TC
The MFC tells us the rise in cost per unit increase in the resourceWhen Δ Quantity of Resource = 1 MFC is increase in cost from employing one more unit of resource
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Marginal Approach to Profit
• To maximize profit firm should increase its employment of any resource whenever MRP > MFC– But not when MRP < MFC
• Profit-maximizing quantity of any resource is quantity at which MRP = MFC
• If MRP > MFC, employing more of resource increases revenue more than cost– Profit will rise
• When MRP < MFC, using more of resource adds more to cost than to revenue– Profit falls
• When firm exploits every opportunity to increase profit it will arrive at the point at which MRP = MFC
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The Firm’s Employment Decision When Only Labor Is Variable
• The Firm’s MRP in a Competitive Product Market – When output is sold in a competitive product market
• MRP for any change in employment will equal price of output (P) times marginal product of labor (MPL)
– MRP = P x MPL
• The Firm’s MFC in a Competitive Labor Market– When labor is hired in a competitive labor market, MFC
for any change in employment will equal market wage rate (W)
• MFC = W
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The Profit-Maximizing Employment Level
• Marginal approach to profit– A firm should take any action that adds more to
its revenue than to its cost
• Hire another worker when MRP > W, but not when MRP < W
• To maximize profit, the firm should hire the number of workers such that MRP = W– Where the MRP curve intersects the wage line
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The Profit-Maximizing Employment Level
MRP
Wage
2Number
of Workers
Dollars
$200
1 3 4 5 6 7 8
150
6050
100
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The Two Approaches to Profit Maximization
• Two different approaches for the firm to follow to maximize profit– MR and MC approach to find profit-maximizing output– MRP and MFC approach to find profit-maximizing employment
• Can these two approaches lead to different decisions? – No, because these two “different” approaches are actually the same
method viewed in two different ways– Remember that hiring another worker increases the firm’s output and
therefore changes both its revenue and its cost
• Whenever MRP > MFC for a change in employment, MR > MC for associated rise in output
• Whenever MRP < MFC for a change in employment, MR < MC for associated rise in output
• If MRP = MFC for a change in employment, MR = MC for associated change in output
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The Firm’s Labor Demand Curve
• When labor is the only variable input, downward-sloping portion of MRP curve is firm’s labor demand curve– Tells us how much labor firm will want to
employ at each wage rate
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The Firm’s Labor Demand Curve
Firm’sLabor Demand
Curve
W 2
W1
B
A
n1Number of Workers
Dollars
n2
W2
W 1
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The Firm’s Employment Decision When Several Inputs are Variable
• Whether the firm can vary just labor, or several inputs simultaneously– Optimal level of employment will satisfy the
MRP = W rule
• Firm’s labor demand curve will slope downward
• Decrease in wage rate will cause an increase in employment
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The Employment Decision with Several Variable Inputs
W2
W1
MRP 1
B
1
of Workers2 3
n n n Number
Dollars
W2
W1
Firm’sLabor
DemandCurve
MRP2
C
A
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The Market Demand For Labor
• Market Labor Demand Curve–Indicates total number of workers all
firms in a labor market want to employ at each wage rate
–Found by horizontally summing across all firms’ individual labor demand curves
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The Market Demand For Labor
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A Shift in the Labor Demand Curve
n1 Number of Workers
Hourly Wage
n2
$10
(a) Typical Firm
L1D
L2D
Number of Workers
Hourly Wage
(b) Labor Market
N1 N2
BA
d2d
1
A B
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Shifts in the Market Labor Demand Curve
• A change in any variable that affects quantity of labor demanded—except for the wage rate—causes labor demand curve to shift
• Specific variables that shift the labor demand curve include a change in– Demand for the firm’s product– Technology– Prince of another input– Number of firms
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A Change in Demand for the Firm’s Output
• Effect of a change in output price on labor demand depends on whether many firms in the labor market also share the same product market
• When they do– A rise in output price will shift market labor
demand curve rightward– A fall in output price will shift market labor
demand curve leftward
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A Change in Technology
• Complementary Input– An input whose utilization increases
marginal product of another input
• Substitute Input– An input whose utilization decreases
marginal product of another input
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A Change in Technology
• When many firms in a labor market acquire a new technology, the market labor demand curve will shift – Rightward if technology is complementary
with labor
– Leftward if technology is substitutable for labor
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Introducing a New Input
More of a
Substitutable Input
More of a
Complementary Input
d
d
3
Number of Workers
Hourly Wage
d1
2
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A Change in the Price of Another Input
• When price of some other input decreases, market labor demand curve may shift–Rightward if the input is
complementary with labor
–Leftward if the input is substitutable for labor
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Individual Labor Supply
• Individuals as wage takers– No single labor seller can affect the
market wage
– In a competitive labor market• Each seller is a wage taker
– He or she takes market wage rate as given
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The Income-Leisure Trade-off
• Wage rate determines exact nature of the income-leisure trade-off–Higher the income »» higher the
expense of leisure time
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The Labor Supply Decision
• Individuals who are able to choose their own hours may– Choose optimal combination of income and
leisure
• Individuals who are not able to choose their own hours– Only make the choice of whether to offer their
labor in a particular market or not
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Reservation Wages
• Lowest wage rate at which an individual would supply labor to a particular labor market
• When wage rate in a market exceeds an individual’s reservation wage for that market– Individual will decide to work there
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Market Labor Supply
• Curve indicating the number of people who want jobs in a labor market at each wage rate–The higher the wage rate, the greater
the quantity of labor supplied
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Figure 8: The Market Labor Supply Curve
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Shifts in the Market Labor Supply Curve
• A market labor supply curve will shift when – Something other than a change in wage rate causes a
change in number of people who want to work in a particular market
• Factors causing a labor supply curve to shift include– Change in market wage rate in other labor markets– Changes in cost of acquiring human capital– Number of qualified people– Changes in tastes
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A Change in the Market Wage Rate in Other Labor Markets
• As long as some individuals can choose to supply their labor in two different markets– A rise in wage rate in one market will
cause a leftward shift in labor supply curve in other market
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Changes in the Cost of Acquiring Human Capital
• An increase in the cost of acquiring human capital will shift the labor supply curve leftward
• A decrease in the cost of acquiring human capital will shift the labor supply curve rightward
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Number of Qualified People
• Population growth causes labor supply curves in both national and local labor market to shift rightward over time
• Labor supply curves can also shift due to migration within a country
• If new people entering a field exceeds number of retirees in that field– Increase in supply results
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Changes in Tastes
• Different types of jobs attract different people with different tastes–Danger and excitement vs. safety
and routine
• Women entering the workforce
• Social contribution to community
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Short-Run vs. Long-Run Labor Supply
• Short-run– Labor supply response to a wage-rate change comes
from those who already have skills and geographic location needed to work in a market
• Long-run– Labor supply response to a wage-rate change comes
from those who will acquire skills and move into geographic location needed to work in a market
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Short-Run vs. Long-Run Labor Supply
• Long-run labor supply curve indicates how many (qualified) people will want to work in a labor market – After full adjustment to a change in the
wage rate
• Long-run labor supply response is more wage elastic than short-run labor supply response
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The Long-Run Labor Supply Curve
L1S
LLRS L2
S
30,000 60,000 90,000 Number of Workers
HourlyWage
25
$40B
A
C
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Labor Market Equilibrium
• Supply and demand will drive a competitive labor market to its equilibrium point–Point where the labor supply and
labor demand curves intersect
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Labor Market Equilibrium
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What Happens When Things Change?
• Events that can cause labor demand curve and labor supply curve to shift include– Change in labor demand
– Change in labor supply
– Labor shortages and surpluses
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A Change in Labor Demand
• In short-run, shift in labor demand moves along a short-run labor supply curve
• In long-run, resulting increase in wage rate will cause short-run labor supply curve to shift also
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A Change in Labor Demand
L2S
L1D
L2D
L1S
C
5,000 Numberof Workers
Wage
8,000 12,000
30
$40
Numberof Workers
Labor Market Typical Firm
W1
W3
W2
50 80 120
Dollars
20
30
$40
20
1d
2d
A
B
c
b
a
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Change in Labor Supply
• Shifts in labor supply typically happen slowly
• When a long-run change in labor supply is the cause of changes in the labor market– No separate short-run change in
equilibrium to investigate
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The Market For Finance Professors (1995-2002)
L1
S
L1D
2LD
L2S
A
1N2Number
of New Finance
Annual Wage
66,900
N
$91,200B
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Labor Shortages and Surpluses
• Labor Shortage– Quantity of labor demanded exceeds
quantity supplied at prevailing wage rate
• Labor Surplus– Quantity of labor supplied exceeds
quantity demanded at prevailing wage rate
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Labor Shortages and Surpluses
• Shortages and surpluses in a labor market are not natural consequence of shifts in supply and demand curves– Labor shortage will occur only when wage rate
fails to rise to its equilibrium value– Labor surplus will occur only when wage rate
fails to fall to its equilibrium value
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Using the Theory: Understanding the Market for College-Educated Labor
• Students have many motives for attending college• One of the most important motives is to invest in
their own human capital– Going to college will enable you to earn a higher
income than you would otherwise be able to earn– Economists track the college wage premium
• Percentage by which average college graduate’s income exceeds average high school graduate’s income
– Wage premium was relatively stable in 1960s and 1970s, at around 40 to 50%
– But premium began to rise sharply in 1980s and continued its rise through 1990s
– By 2001 college wage premium reached 76% for men and 97% for women
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Using the Theory: Understanding the Market for College-Educated Labor
• Why did labor supply shift rightward each year?– An increase in proportion of young people
attending college– Population itself increased
• Why did labor demand curve shift rightward each year?– Partly due to normal growth in economy– Technological change
• Increase skill requirements for many types of work
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The Market for College-Educated Labor
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Using the Theory: Understanding the Market for College-Educated Labor
• An increase in yearly wage rate has resulted over last two decades– Because demand curve for college graduates shifted
rightward faster than supply curve
• What will happen in the future?– Competing trends
• Acceleration in rightward shift of labor supply curve for college graduates
– Will work to decrease college wage premium
• Acceleration in rightward shift of labor demand curve for college graduates
– Due to further changes in technology
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Using the Theory: Understanding the Market for College-Educated Labor
• Most labor market economists predict– For college-educated labor
• Labor demand curve will shift rightward more rapidly than labor supply curve over next several years
• Wage rate for college graduates is expected to rise
– For high school graduates• Shifts in labor supply curve are expected to outpace
shifts in demand curve– Wage premium for college students is expected to increase