Principles of Macroeconomics - Chapter 15: Household and Firm Behavior in the Macroeconomy

Households: Consumption and Labor Supply Decisions

• Transition from Previous Chapters:     * In earlier macroeconomic models (Chapters 23-29), it was assumed that household consumption depended solely on income and that firms’ planned investment depended only on the interest rate.     * Chapter 15 introduces a more realistic and exhaustive look at the factors influencing these decisions.

• The Life-Cycle Theory of Consumption:     * Definition: A theory of household consumption where households make lifetime consumption decisions based on their expectations of lifetime income.     * Permanent Income: Defined as the average level of a person’s expected future income stream.     * Consumption Patterns Over the Life Cycle:         * Early Working Years: People tend to consume more than they earn, often borrowing against future income.         * Mid-Working Years: People save (consume less than they earn) to pay off debts from previous borrowing and to accumulate savings for retirement.         * Retirement Years: People consume more than they earn, using accumulated savings.

• The Labor Supply Decision:     * Determinants of Labor Force Size: Influenced by demographics, legal immigration, illegal immigration, and household behavior.     * Wage Rate Effects:         * Substitution Effect: A higher wage rate increases the opportunity cost of leisure, leading to a larger quantity of labor supplied.         * Income Effect: Since leisure is a normal good, higher income (from higher wages) leads people to consume more leisure and work less.     * Nominal vs. Real Wages:         * Nominal Wage Rate: The wage rate expressed in current dollars.         * Real Wage Rate: The amount the nominal wage rate can buy in terms of goods and services. Households evaluate current and expected future real wage rates when making labor supply decisions.

• Wealth and Nonlabor Income:     * Wealth Effect: Holding the life-cycle stage constant, higher household wealth leads to increased consumption in both the present and future.     * Nonlabor (Nonwage) Income: Income from sources other than working, including inheritances, interest, dividends, and transfer payments.     * Impact: Unexpected increases in nonlabor income or wealth lead to increased household consumption but a decrease in labor supply.

• Interest Rate Effects on Consumption:     * Substitution Effect: A rise in the interest rate incentivizes saving more and consuming less today.     * Income Effect: For households with positive wealth earning interest, a fall in interest rates reduces interest income, potentially impacting consumption.

• Government Effects (Taxes and Transfers):     * Transfer Payments: Includes Social Security benefits, veterans’ benefits, and welfare benefits.     * Effect Magnitude: Changes are more impactful if they are expected to be permanent rather than temporary.     * Impact Matrix:         * Increase in Income Tax Rates: Negative effect on consumption; negative effect on labor supply (assuming substitution effect dominates).         * Decrease in Income Tax Rates: Positive effect on consumption; positive effect on labor supply (assuming substitution effect dominates).         * Increase in Transfer Payments: Positive effect on consumption; negative effect on labor supply.         * Decrease in Transfer Payments: Negative effect on consumption; positive effect on labor supply.

• Employment Constraints on Households:     * Unconstrained Supply of Labor: The amount a household would like to work at the current wage rate if work were available.     * Constrained Supply of Labor: The actual amount a household works at the current wage rate (limited by availability of jobs).     * Keynesian Theory Revisited: In the presence of unemployment, current income (rather than the real wage rate) becomes the primary determinant of current consumption.

Historical Trends in the Household Sector (Since 1970)

• Consumption Smoothing: Expenditures on services and nondurable goods are significantly "smoother" (less volatile) over time compared to expenditures on durable goods.

• Housing Investment: This sector is highly postponable and fell significantly during the six recessionary periods since 1970.

• Labor Force Participation (LFP) Trends:     * Prime-Age Men (25 to 54): The rate has been decreasing slightly since 1970.     * Prime-Age Women (25 to 54): The rate has increased dramatically since 1970.     * Others (16 and over): LFP has declined since 1979 and tends to fall during recessions due to the discouraged-worker effect.

• COVID-19 Impact:     * In 2019, unemployment was at $3.6\%$.     * LFP declined drastically from $63.3\%$ to $60.8\%$ following pandemic responses.     * One-half of the decline recovered quickly, but the full labor market recovery took approximately two years.

Firms: Investment and Employment Decisions

• Expectations and Animal Spirits:     * Animal Spirits of Entrepreneurs: A term coined by John Maynard Keynes to describe the emotional and intuitive feelings of investors that influence economic activity.

• The Accelerator Effect:     * Definition: The tendency for investment to increase specifically when aggregate output increases and to decrease when aggregate output decreases.     * Impact: This effect accelerates the overall growth or decline of total output.

• Excess Labor and Excess Capital Effects:     * Definitions: Labor and capital on hand that are not currently required to produce the firm's existing level of output.     * Adjustment Costs: Costs incurred when changing production levels, such as administrative costs for layoffs or training costs for new hires.

• Inventory Investment:     * Definition: The change in the stock of inventories; equals Production minus Sales.     * Optimal Level of Inventories: The stock level where the extra cost (lost sales) from lowering inventories equals the extra gain (interest revenue and lower storage costs).     * Relationship to Production: Current production depends on expected future sales. An unexpected increase in inventory stocks usually has a negative effect on future production levels.

• Summary of Firm Behavior Factors:     * Expectations of future output.     * The wage rate and the cost of capital.     * The existing amount of excess labor and excess capital.

Historical Trends in the Firm Sector (Since 1970)

• Plant-and-Equipment Investment: This declined in each of the five recessionary periods since 1970.

• Employment Growth: Growth in firm-sector employment was generally negative during the five recessions since 1970.

• Inventory Ratios: The inventory-to-sales ratio measures the stock of inventories against the level of sales. Inventory investment is noted as being highly volatile.

Productivity and the Business Cycle

• Productivity (Labor Productivity): Measured as output per worker hour ($\text{output/labor ratio}$).

• Cyclical Nature: Productivity is procyclical, meaning it tends to rise during economic expansions and fall during contractions.

• Reasoning: Employment does not fluctuate as much as total output over the business cycle; because firms may hold excess labor during downturns to avoid adjustment costs, measured productivity falls when output drops faster than hours worked.

The Short-Run Relationship Between Output and Unemployment

• Okun’s Law:     * Initial Theory: Proposed by Arthur Okun, stating that in the short run, the unemployment rate decreases by approximately $1$ percentage point for every $3\%$ increase in real GDP.     * Variables: If $E$ is number of people employed, $L$ is the labor force, and $u$ is the unemployment rate.     * Stability: Modern research shows this relationship is not as stable as originally predicted.

• The Discouraged-Worker Effect:     * The decline in the measured unemployment rate occurs because people who cannot find work stop looking and drop out of the labor force entirely. This effectively lowers the official unemployment rate without an increase in employment.

The Size of the Multiplier

• Factors That Decrease Multiplier Size:     1. Automatic stabilizers.     2. Interest rate changes.     3. Responses of the price level.     4. Existence of excess capital and excess labor.     5. Inventory holdings.     6. Expectations regarding the future.

• The Multiplier in Practice:     * The practical value of the multiplier is estimated to be around $2.0$.     * The size is also contingent upon the duration of time since the spending increase initiated.

• Estimating Multipliers (The Mafia Link Case Study):     * Mechanism: In Italy, discovering Mafia involvement in a city council led to the firing of officials and replacement by three national commissioners.     * Economic Impact: This administrative shift reduced public spending by an average of $20\%$.     * Findings: Because Mafia involvement varied by region, these spending cuts allowed economists to estimate regional multipliers, which were found to range from $1.5$ to $2$.

Questions & Discussion

• Labor Force Participation:     * Question: Who, other than macroeconomists, might be interested in labor force participation rates?     * Context: Discussed in relation to the post-COVID-19 recovery and the long-term decline in participation prior to 2019.

• Multipliers:     * Question: Who, other than macroeconomists, might be interested in multipliers?     * Context: Discussed following the Italian Mafia Case Study which provided unique data on public spending impacts.