1. Abel, Andrew B_Bernanke, Ben S_Croushore, Dean - Macroeconomics-Pearson (2013)_removed (2)

Chapter 2 Notes: Productivity, Output, and Employment

The Labour Market

This chapter focuses on the labour market, one of the three aggregate markets used in the unified approach to macroeconomics. As labour is the most important input to production, understanding the labour market is crucial for analysing the long-term behaviour of an economy, particularly in relation to full employment.

The Production Function

  • A production function specifies the relationship between the quantities of inputs used in production and the quantity of output produced.

  • A general production function is represented as: Y = AF(K, N).

    • Y: Output.

    • A: Total factor productivity.

    • K: Capital.

    • N: Labour.

Properties of Production Functions

  • The production function exhibits constant returns to scale. If all inputs are changed by the same proportion, output will change by that proportion as well.

  • The production function exhibits diminishing marginal productivity of each input. As the quantity of one input is increased while holding the quantities of other inputs constant, the marginal product of that input will eventually decline.

The Demand for Labour

  • Firms hire labour to produce goods and services.

  • The marginal product of labour (MPN) is the extra output produced by one additional unit of labour, holding other inputs constant.

  • The marginal revenue product of labour (MRPN) is the extra revenue generated by one additional unit of labour, holding other inputs constant.

  • MRPN = MPN * P, where P is the price of the firm's output.

Profit Maximisation and Labour Demand

  • To maximise profits, a firm will hire labour up to the point at which the MRPN equals the nominal wage (W).

  • If the MRPN is greater than W, the firm can increase profits by hiring more workers.

  • If the MRPN is less than W, the firm can increase profits by hiring fewer workers.

Factors That Shift Labour Demand

  1. A Beneficial Supply Shock: A supply shock that increases productivity (A in the production function) will shift the labour demand curve to the right.

  2. An Increase in the Price of Output: An increase in the price of output (P) will also shift the labour demand curve to the right (as MRPN = MPN * P).

The Supply of Labour

  • The supply of labour is determined by the number of people willing to work at each wage.

  • The real wage (w), not the nominal wage, is the key determinant of labour supply. The real wage is the nominal wage (W) divided by the price level (P): w = W/P.

Factors That Shift Labour Supply

  1. Changes in wealth or expected future income: Increases in wealth or expected future income will decrease labour supply.

  2. Changes in working-age population: An increase in the working-age population will increase labour supply.

  3. Changes in participation rate: A higher participation rate, which is the percentage of the working-age population that is in the labour force, will increase labour supply.

Labour Market Equilibrium

  • Labour market equilibrium occurs when the quantity of labour demanded equals the quantity of labour supplied.

  • The equilibrium real wage equates labour supply and demand.

  • Equilibrium in the labour market determines the full-employment level of employment and the full-employment level of output.

Unemployment

Measuring Unemployment

  • Labour Force: The sum of employed and unemployed workers.

  • Unemployment Rate: The percentage of the labour force that is unemployed.

  • Participation Rate: The percentage of the working-age population that is in the labour force.

  • Employment Ratio: The percentage of the working-age population that is employed.

Types of Unemployment

  1. Frictional Unemployment: Arises as workers search for suitable jobs and firms search for qualified employees. A certain amount of frictional unemployment is natural and necessary for a well-functioning economy.

  2. Structural Unemployment: Results from a mismatch between the skills or location of workers and the requirements or location of available jobs.

  3. Cyclical Unemployment: The difference between the actual unemployment rate and the natural rate of unemployment, which is the rate of unemployment that exists when the economy is at full employment. Cyclical unemployment is associated with fluctuations in the business cycle.

Okun's Law

Okun's Law states that a 1 percentage point increase in the unemployment rate is associated with a 2% decline in output.

Exercises

The sources contain a set of exercises for Chapter 2. Completing these exercises will help you apply the concepts covered in the chapter.


Chapter 2 Notes: Productivity, Output, and Employment - Continued

Example: The Clip Joint

The sources use the example of a dog grooming business called The Clip Joint to illustrate the concepts of labour demand, productivity shocks, and profit maximisation.

  • The Clip Joint's profit-maximising level of employment is determined by comparing the marginal revenue product of labour (MRPN) with the nominal wage (W).

  • If the MRPN exceeds W, hiring an additional worker is profitable.

  • If the MRPN is less than W, the firm should reduce employment to maximise profits.

Productivity Shocks

A beneficial productivity shock, such as the introduction of New Age music that doubles the number of dogs groomed per day, will shift the labour demand curve to the right, leading to an increase in the quantity of labour demanded at a given real wage.

Real vs. Nominal Terms

  • The comparison between the benefits and costs of additional labour can be made in either real or nominal terms.

  • In real terms, the firm compares the marginal product of labour (MPN) with the real wage (w), which is the nominal wage (W) divided by the price of output (P).

  • In nominal terms, the firm compares the marginal revenue product of labour (MRPN) with the nominal wage (W). Both methods yield the same result for the profit-maximising level of employment.

Data Sources for Labour Market Analysis

The sources highlight two primary data sources for labour market analysis in the United States:

  1. Household survey: Used to calculate employment and the unemployment rate.

  2. Establishment survey (payroll survey): Based on responses from businesses about their employment, hours worked, and employee earnings.

  • The establishment survey is more comprehensive and closely related to output, but the household survey provides information about unemployment.

Okun's Law and Output Fluctuations

  • Okun's Law explains the relationship between changes in the unemployment rate and changes in output.

  • A 1 percentage point increase in the unemployment rate leads to a larger drop in output (about 2%) because other factors that determine output, such as the number of people in the labour force, hours worked, and average labour productivity, also tend to fall during periods of cyclical unemployment.

Chapter 2 Exercises

The sources provide a list of exercises to help readers apply the concepts covered in the chapter. These exercises cover topics such as:

  • Calculating labour market statistics like the unemployment rate, participation rate, and employment ratio.

  • Analysing the effects of supply shocks on labour market equilibrium.

  • Understanding the relationship between the unemployment rate and the employment ratio.

Completing these exercises will help you solidify your understanding of the key concepts presented in Chapter 2.