Unit VII
Factor Markets
Chapter 20
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?
Varied Markets
Labor Markets
Labor market
– collection of people and firms who are trading
labor services
• Job
– contract between a firm and a household to
provide labor services
Varied Markets
Financial Markets
• Capital
– tools, instruments, machines, and other
constructions that have been produced in the
past and that businesses use to produce goods
and services
• Financial capital
– funds that firms use to buy and operate
physical capital
Varied Markets (Financial cont.)
• Financial Market
– A collection of people and firms who are
lending and borrowing to finance the purchase
of physical capital.
– The two main types of financial market are
• Stock market
• Bond market
Varied Markets
Stock Market
• market in which the shares in the stocks of
companies are traded
– Examples: New York Stock Exchange,
NASDAQ
Varied Markets
Bond Market
• market in which bonds issued by firms or
governments are traded
Bond
• promise to pay specified sums of money
on specified date
Anatomy of Factor Markets
Land Markets
• land consists of all the gifts of nature
• market in which raw materials are traded are
called a commodity market
Competitive Factor Markets
• most factor markets have many buyers and sellers
and are competitive markets
Factors of Production and Factor
Markets
• Factors of production: inputs used to
produce goods and services
– Labor
– Land
– Capital: equipment and structures used
to produce goods and services
• prices and quantities of these inputs are
determined by supply & demand in factor
markets
Derived Demand
• Markets for the factors of production are
like markets for goods & services,
except:
– Demand for a factor of production is a
derived demand
• derived from a firm’s decision to supply a good
in another market
The Versatility of Supply and
Demand
(a) The Market for Apples
(b) The Market for Apple Pickers
Price of
Apples
Wage of
Apple
Pickers
Supply
P
Supply
W
Demand
Demand
0
Q
Quantity of
Apples
0
L
Quantity of
Apple Pickers
The apple producer’s demand for apple pickers is derived
from the market demand for apples.
Two Assumptions
1. We assume all markets are competitive.
The typical firm is a price taker
– in the market for the product it produces
– in the labor market
2. We assume that firms care only about
maximizing profits
– Each firm’s supply of output and demand for
inputs are derived from this goal
Our Example: Farmer Jack
• Farmer Jack sells wheat in a perfectly
competitive market
• He hires workers in a perfectly competitive
labor market
• When 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
Our Example: Farmer Jack
• Cost of hiring another worker:
the wage – the price of labor
• Benefit of hiring another worker:
Jack can produce more wheat to sell,
increasing his revenue
• size 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
Farmer Jack’s Production Function
Q (bushels
(no. of of wheat
workers) per week)
3,000
Quantity of output
L
2,500
0
0
1
1000
2
1800
3
2400
500
4
2800
0
5
3000
2,000
1,500
1,000
0
1
2
3
4
No. of workers
5
Marginal Product of Labor (MPL)
• Marginal product of labor: the increase
in the amount of output from an additional
unit of labor MPL = ∆Q
∆L
where
∆Q = change in output
∆L = change in labor
The Value of the Marginal Product
• Problem:
– cost of hiring another worker (wage) is measured in
dollars
– benefit of hiring another worker (MPL) is measured in
units of output
• Solution: convert MPL to dollars
• Value of the marginal product: the marginal
product of an input times the price of the output
VMPL = value of the marginal product of labor
= P x MPL
The Value of the Marginal Product
VMPL = value of the marginal product of
labor
= P x MPL
Sometimes referred to as Marginal
Revenue Product or MRP.
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
Q
(no. of
(bushels
workers) of wheat)
0
0
1
1000
2
1800
3
2400
4
2800
5
3000
MPL
VMPL
A C T I V E L E A R N I N G 1:
Answers
Farmer Jack’s
L
Q
MPL = VMPL =
production
(no. of
(bushels
function
workers) of wheat) ∆Q/∆L P x MPL
exhibits
0
0
diminishing
1000 $5,000
1
1000
marginal
800
4,000
product:
2
1800
600
3,000
MPL falls as
3
2400
L increases.
400
2,000
This property
is very
common.
4
2800
5
3000
200
1,000
A C T I V E L E A R N I N G 1:
Answers
The VMPL curve
Farmer
Jack’s VMPL
curve is
downward
sloping,
due to
diminishing
marginal
product.
$6,000
5,000
4,000
3,000
2,000
1,000
0
0
1
2
3
4
L (number of workers)
5
Farmer Jack’s Labor Demand
Suppose wage
W = $2500/week.
How many
workers should
Jack hire?
Answer: L = 3
At any smaller
larger L,L,
can increase profit
by hiring another
one
worker.
fewer worker.
The VMPL curve
$6,000
5,000
4,000
3,000
$2,500
2,000
1,000
0
0
1
2
3
4
L (number of workers)
5
VMPL and Labor Demand
For 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.
W
W1
VMPL
L1
L
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.
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.
Demand for a factor of production
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.
The
orange
line is
the
firm’s
value of
the
marginal
product
of labor
curve.
Recall from previous slides
• A Firm’s Demand for Labor
– firm hires labor up to the point at which the value
of marginal product equals the wage rate
– if value of marginal product of labor exceeds the
wage rate, a firm can increase its profit by
employing one more worker
– if wage rate exceeds the value of marginal product
of labor, a firm can increase its profit by employing
one fewer worker
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.
The demand for labor
curve slopes
downward because
the value of the
marginal product of
labor diminishes as
the quantity of labor
employed increases.
The Marginal Revenue Product of Labor
The Relationship between the Marginal
Revenue Product of Labor and the Wage
WHEN …
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.
Shifts in Labor Demand
Labor demand curve
= VMPL curve.
W
VMPL = P x MPL
Anything that
increases P or
MPL at each L
will increase
VMPL and shift
labor demand curve
upward.
D2
D1
L
Things that Shift the Labor Demand
Curve
• Changes in the output price, P
• Technological 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
The Connection Between Input
Demand & Output Supply
• Recall: marginal cost (MC)
= cost of producing an additional unit of output
= ∆TC/∆Q, where TC = total cost
• Suppose W = $2500, MPL = 500 bushels
• If Farmer Jack hires another worker,
∆TC = $2500, ∆Q = 500 bushels
MC = $2500/500 = $5 per bushel
• In general: MC = W/MPL
The Connection Between Input
Demand & Output Supply
• In general:
MC = W/MPL
• Notice:
–
–
–
–
To produce additional output, hire more labor
As L rises, MPL falls
causing W/MPL to rise
causing MC to rise
• Hence, diminishing marginal product and
increasing marginal cost are two sides
of the same coin
The Connection Between Input
Demand & Output Supply
• The competitive firm’s rule for demanding labor:
P x MPL = W
• Divide both sides by MPL:
P = W/MPL
• Substitute MC = W/MPL from previous slide:
P = MC
• this is the competitive firm’s rule for supplying
output
• Hence, input demand and output supply are
two sides of the same coin
Labor Supply
• People 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.
The Labor Supply Curve
An increase in W
is an increase in
the opp. cost of
leisure.
People respond by
taking less leisure
and by working
more.
W
S1
W2
W1
L1 L2
L
Things that Shift the Labor
Supply Curve
• changes in tastes or attitudes regarding
the labor-leisure trade-off
• opportunities for workers in other labor
markets
• immigration
Equilibrium in the Labor Market
The wage adjusts
to balance supply
and demand for
labor.
The wage always
equals VMPL.
W
S
W1
D
L1
L
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.
A C T I V E L E A R N I N G 2A:
Answers
The market for
The retirement of
Baby Boomer auto
workers shifts
supply leftward.
W rises, L falls.
autoworkers
W
S2
S1
W2
W1
D1
L2 L1
L
A C T I V E L E A R N I N G 2B:
Answers
The market for
A 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.
autoworkers
W
S1
W1
W2
D2
L2 L1
D1
L
A C T I V E L E A R N I N G 2C:
Answers
The market for
At each L,
MPL rises due to
tech. progress.
VMPL rises and
labor demand
curve shifts
upward.
W and L increase.
autoworkers
W
S1
W2
W1
D2
D1
L1 L2
L
Productivity and Wage Growth in
the U.S.
time
period
growth
rate of
productivity
growth
rate
of real
wages
1959-2003
2.1%
2.0%
1959-1973
2.9
2.8
1973-1995
1.4
1.2
1995-2003
3.0
3.0
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.
The Other Factors of Production
• With land and capital, must distinguish
between:
– purchase price – the price a person pays to own
that factor indefinitely
– rental price – the price a person pays to use that
factor for a limited period of time
• wage is the rental price of labor
• The determination of the rental prices of
capital and land is analogous to the
determination of wages…
How the Rental Price of Land Is
Determined
Firms 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.
P
The market
for land
S
P
D = VMP
Q
Q
How the Rental Price of Capital Is
Determined
Firms 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.
P
The market
for capital
S
P
D = VMP
Q
Q
Rental and Purchase Prices
• Buying a unit of capital or land yields a
stream of rental income
• rental 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
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 factors
• Example: an increase in the quantity of
capital
– The marginal product and rental price of
capital fall
– Having more capital makes workers more
productive, MPL and W rise
Markets for Labor
• How does a college degree affect future earning?
Equilibrium in the Labor Market
• The Effect on Equilibrium Wages of a
Shift in Labor Supply
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.
Differences in Wages
• Baseball players are paid more than
college professors.
Explaining Differences in Wages
• Compensating Differentials
Higher wages that compensate workers
for unpleasant aspects of a job
• Discrimination (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
Non-perfectly competitive labor
Markets
• Monopsony
Firm is a price maker and has the power
to affect wages
CONCLUSION
• The theory in this chapter is called the
neoclassical theory of income distribution
• It states that
– factor prices determined by supply and demand
– each factor is paid the value of its marginal
product
• Most economists use this theory a starting
point for understanding the distribution of
income.
CHAPTER SUMMARY
• The 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.
CHAPTER SUMMARY
• The 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.