1. Chapter 2 Labor Supply McGraw-Hill/Irwin
Copyright © 2010 by The McGraw-Hill Companies, Inc. All rights reserved.

2. Introduction to Labor Supply
Labor facts
Men: labor force participation rates declined from 90% in 1947 to 75% in 1990.
Women: labor force participation rates rose from 32% in 1947 to 60% in 1990.
Hours worked fell from 40 to 35 per week during the same time period.

3. Measuring the Labor Force
Current population survey (CPS)
Labor Force = Employed + Unemployed
LF = E + U
Size of LF does not tell us about “intensity” of work.
Labor Force Participation Rate
LFPR = LF/P
P = civilian adult population 16 years or older not in institutions.

4. Measuring the Labor Force
Current population survey (CPS)
Employment: Population Ratio (percent of population that is employed).
EPR = E/P
Unemployment Rate
UR = U/LF

5. Measuring the Labor Force
Labor force measurement relies on subjectivity and likely understates the effects of a recession.
Hidden unemployed: persons who have given up in their search for work and have therefore left the labor force.
The employment rate (E/P) can be a better measure of fluctuations in economic activity than the unemployment rate.

6. Labor Force Participation Facts
Labor force participation (LFP) is greatest for all groups during the ages of 25 to 55.
LFP increases with education.
LFP has decreased for men over the age of 65 from 63% in 1900 to under 20% by 2000.

7. Labor Force Participation Facts
More women than men work part-time.
More men who are high school drop outs work than women who are high school drop outs.
White men have higher participation rates and hours of work than black men.

8. Average hours worked/week 1900-2007

9. Neo-Classical Model of Labor-Leisure Choice
Utility Function
Measure of satisfaction that individuals receive from consumption (C) of goods and leisure (L).
U = f(C, L)
U is an index.
Higher U means happier person.

10. Indifference Curves
Downward sloping, indicating the tradeoff between consumption and leisure.
Higher curves = higher utility.
Do not intersect.
Convex to the origin, indicating that opportunity costs increase.

11. Indifference Curves Consumption ($) 40,000 Utils 25,000 Utils
500
450
400
40,000 Utils
25,000 Utils
100+
125
150
Hours of Leisure

12. Differences in Preferences
Workers with steeper indifference curves value their leisure relatively more than workers with shallower indifference curves. U0 U1
Consumption ($)
Hours of Leisure

13. The Budget Constraint
The budget constraint defines the worker’s opportunity set, indicating all of the consumption – leisure baskets the worker can afford.
C = wh + V
Consumption equals labor earning (wages × hours of work) plus nonlabor income (V).
As h = T – L, can rewrite C = w(T – L) + V.

14. Graphing the Budget ConstraintV
wT+V
Hours of
Leisure
Consumption ($)
Budget Line

15. The Hours of Work Decision
Individuals choose consumption and leisure to maximize utility.
Optimal consumption is given by the point where the budget line is tangent to the indifference curve.
At this point the marginal rate of substitution (MRS) between consumption and leisure equals the wage.
Any other consumption – leisure bundle on the budget constraint would give the individual less utility.

16. Optimal Consumption and Leisure
$1200 A Y
$1100 P
$500 U1 U*
$100 E U0
Hours of Leisure 70
110
Hours of Work
110 40

17. The Effect of a Change in Nonlabor Income on Hours of WorkP1
$200 U1 U0 E1 E0 P0 70 80
110 F0
$100
Consumption ($)
Hours of Leisure
An increase in nonlabor income leads to a parallel, upward shift in the budget line, moving the worker from point P0 to point P1. If leisure is a normal good, hours of work fall.

18. The Effect of a Change in Nonlabor Income on Hours of WorkP1
$200 U1 U0 E1 E0 P0 70 60
110 F0
$100
Consumption ($)
An increase in nonlabor income leads to a parallel, upward shift in the budget line, moving the worker from point P0 to point P1. If leisure is inferior, hours of work increase.

19. More Leisure at a Higher Wage
When the income effect dominates the substitution
effect, the worker increases hours of leisure in
response to an increase in the wage.
Consumption ($) G U1 R D Q U0 D F P V E 70 75 85
110
Hours of Leisure

20. More Work at a Higher Wage
When the substitution effect dominates the income
effect, the worker decreases hours of leisure in
response to an increase in the wage. G D F E U1 Q R P U0 V 80 70
110 65
Consumption ($)
Hours of Leisure

21. To Work or Not to Work?
Are the “terms of trade” sufficiently attractive to “bribe” a worker to enter the labor market?
Reservation wage: the lowest wage rate that would make the person indifferent between working and not working.
Rule 1: if the market wage is less than the reservation wage, then the person will not work.
Rule 2: the reservation wage increases as nonlabor income increases

22. The Reservation Wage Consumption ($) Hours of Leisure H
Has Slope -whigh Y G X UH E U0
Has Slope -w T
Hours of Leisure

23. Labor Supply Curve
Relationship between hours worked and the wage rate.
At wages slightly above the reservation wage, the labor supply curve is positively sloped (the substitution effect dominates the income effect).
If the income effect begins to dominate the substitution, hours of work decline as the wage rate increases (a negatively sloped labor supply curve).

24. The Backward Bending Labor Supply Curve
Wage Rate ($) 40 20 30 10 25
Hours of Work

25. Labor Supply Elasticity
The labor supply elasticity (σ) measures responsiveness in hours worked to changes in the wage rate.
σ = Percent change in hours worked divided by the percent change in wage rate.
Labor supply elasticity less than 1 is inelastic as hours of work respond proportionally less than the change in wages.
Labor supply elasticity greater than 1 is elastic as hours of work respond proportionally more than the change in wages.

26. Labor Supply of Women
Substantial cross-country differences in women’s labor force participation rates.
Over time, women’s participation rates have increased.
In most studies on women, substitution effects dominate income effects (upward sloped labor supply curve).

27. Growth in Female Labor Force Participation Rates and the Wage, Cross Countries 1960-80
Source: Jacob Mincer, “Intercountry Comparisons of Labor Force Trends and of Related Developments: An Overview,” Journal of Labor Economics 3 (January 1985, Part 2): S2, S6.

28. Derivation of the Market Labor Supply Curve from Individual Supply Curves

29. Policy Application: Welfare Programs and Work Incentives
Cash grants reduce wage incentives.
Welfare programs create work disincentives.
Welfare reduces supply of labor by increasing nonlabor income, which raises the reservation wage.

30. Effect of a Cash Grant on Work Incentives
A take-it-or-leave-it cash grant of $500 per week moves the worker from point P to point G, and encourages the worker to leave the labor force. F
Consumption ($)
500
Hours of Leisure
110 70 G U1 U0 P

31. Effect of a Welfare Program on Hours of Work
$500 U0 U1 G E P F R Q H D
110
100 70
slope = -$5
slope = -$10
Consumption ($)

32. Policy Application: The Earned-Income Tax Credit
The EITC should increase labor force participation of nonworkers of targeted groups.
The EITC encourages some non-workers to start working and never encourages a worker to quit working.
The EITC produces an income effect.
Hours worked should change.

33. The EITC and the Budget Line
Hours of Leisure
Consumption ($)
110
10,350
13,520
14,490
17,660
33,178 E J H G F
Net wage is 40% above the actual wage
Net wage equals the actual wage
Net wage is 21.06% below the actual wage

34. Labor Supply over the Life Cycle
Wage rates change over the worker’s life (over the life cycle).
Wages are low when young.
Wages rise with time and peak around age 50.
Wages decline or remain stable after age 50.
The changes in wages over the life cycle are “evolutionary” wage changes that alter the price of leisure.

35. Theoretical Issues of Evolutionary Wages
A person will work more hours when wages are higher (i.e., the substitution effect tends to dominate the income effect).
The profile of hours of work over the life cycle will have the same shape as the age-earnings profile.
Intertemporal substitution hypothesis: people substitute their time over the life cycle to take advantages of changes in the price of leisure.

36. The Life Cycle Path of Wages and Hours for a Typical Worker
Wage Rate 50
Hours of work

37. Hours of Work over the Life Cycle for Two Workers with Different Wage Paths
Joe’s wage exceeds Jack’s at every age. Although both Joe and Jack work more hours when the wage is high, Joe works more hours than Jack if the substitution effect dominates. If the income effect dominates, Joe works fewer hours than Jack.

38. Labor Force Participation Rates over the Life Cycle in 2005

39. Hours of Work over the Life Cycle in 2005

40. Labor Supply Over the Business Cycle
Added-worker effect.
So-called “secondary” workers currently out of the labor market are affected by a recession because the main breadwinner becomes unemployed or faces a wage cut.
A secondary worker may choose to enter the labor force during these bad times
The labor force participation rate of secondary workers (i.e., the added worker effect) is counter-cyclical.

41. Labor Supply Over the Business Cycle
Discouraged worker effect.
Unemployed workers find it very difficult to find jobs during a recession, so they give up searching.
Discouraged workers exit the labor force during bad times.
The labor force participation rate of discouraged workers is pro-cyclical.

42. Labor Supply Over the Business Cycle
The discouraged worker effect dominates the added-worker effect, especially during recessions.

43. Retirement
Lifetime income is higher the longer a worker puts off retirement.
If pension benefits are constant, wage increases have a substitution and income effect, so lifetime income might not be altered.
An increase in pension benefits reduces the price of retirement, increasing the demand for leisure and encouraging the worker to retire earlier.

44. The Impact of the Social Security Earnings Test on Hours of Work
The Social Security earnings test (which taxes retirees when they earn more than $17,000 per year) generates the budget “line” that affects behavior in varying ways.
The repeal of the earnings test moves retirees to another budget line, as a result:
One retiree would not change his hours of work.
A second retiree would reduce his hours.
A third retiree might increase or decrease his hours, depending on whether substitution or income effects dominate.

45. Fertility
Malthus Theory of Fertility: as incomes rise, families want more children (children are normal goods so the income effect is large).
An increase in the price of a person’s time (i.e., an increase in the wage) increases the opportunity cost of exiting the labor market to rear children.

46. The Fertility Decision
Goods
I/pX
Number of Children P
Indifference Curve 3
I/pN
The household’s utility depends on the number of children and on the consumption of goods. A utility-maximizing household chooses point P and has three children.

47. The Impact of Income and Prices on the Household’s Fertility
Goods
Goods
I/PX P R R U1 Q U1 P U0 U0 D 3 4
Number of Children 1 2 3
Number of Children
(a) Increase in Income
(b) Increase in the price of children

48. End of Chapter 2