Age-Earnings Profile

In one sentence

An age-earnings profile describes how average earnings change with age, typically rising early in the career as experience accumulates, flattening, and sometimes declining as workers reduce hours or transition toward retirement.

Why it has a “hump” shape

Key mechanisms include:

human capital accumulation (learning-by-doing, training),
job matching and sorting (workers move to better matches over time),
promotion ladders and firm pay policies,
health and hours (later-life declines in hours or productivity),
cohort and selection effects (who remains employed at older ages).

    flowchart LR
	  A["Early career<br/>(learning, job switching)"] --> B["Mid career<br/>(tenure, promotions)"]
	  B --> C["Late career<br/>(plateau, hours decline, retirement)"]
	  A --> D["Earnings rise quickly"]
	  B --> E["Earnings peak/flatten"]
	  C --> F["Earnings may fall"]

Connection to the Mincer earnings equation

A standard empirical model is:

$$ \ln(w_i) = \beta_0 + \beta_1 S_i + \beta_2 X_i + \beta_3 X_i^2 + \varepsilon_i $$

where $X_i$ is experience. The quadratic term implies earnings rise with experience at first and then eventually decline, generating a hump-shaped profile.

Measurement issues (important)

Age-earnings profiles can be estimated from:

cross-sections (different people at different ages) or
panels (same people over time).

Cross-sectional profiles mix age effects with cohort effects and selection (e.g., lower-earning workers may exit employment earlier), so interpreting them causally requires care.

Why it matters

education and training policy: returns differ over the life cycle.
inequality: earnings profiles differ by gender, sector, and skill group.
pensions and retirement: forecasting contributions and benefits depends on the profile.

Human Capital: The economic value of a worker’s experience and skills.
Earnings Mobility: The ability of workers to move up or down the earnings ladder throughout their career.
Lifetime Earnings: The total earnings accumulated by an individual over their working life.
Intergenerational Earnings Elasticity: A measure of the degree to which earnings remain consistent from one generation to the next.
Career Plateau: A stage in a professional’s career where the likelihood of additional raises diminishes.

Quiz

### An age-earnings profile generally shows: - [x] How earnings change throughout a worker's life - [ ] The ratio of wages to productivity - [ ] Unemployment rates across different age groups - [ ] Investment in human capital per age group > **Explanation:** An age-earnings profile tracks how a worker's earnings evolve with age, reflecting career progression and wage dynamics. ### True or False: The age-earnings profile is the same across all occupations. - [ ] True - [x] False > **Explanation:** Different occupations have varied age-earnings profiles due to differences in skill requirements, experience, and education. ### Key components of an age-earnings profile study often include: - [x] Demographics, education level, and occupation - [ ] Housing prices and inflation rates - [ ] Interest rates and GDP growth - [ ] Export-import balance > **Explanation:** Age-earnings profiles analyze the impact of demographic factors, educational attainment, and job roles on earnings. ### Human capital refers to: - [x] Skills, education, and experience owned by a person - [ ] Physical capital used in production - [ ] Savings and investment portfolios - [ ] Corporate equities and bonds > **Explanation:** Human capital encompasses an individual’s skills, education, and experience, influencing their productivity and earnings potential. ### Higher earnings for middle-aged workers are primarily due to: - [x] Accumulated experience and skills - [ ] Higher physical strength - [ ] Overall GDP growth - [ ] Early career promotions > **Explanation:** Middle-aged workers typically earn more because of the experience and skills they have acquired over time. ### Which curve illustrates the relationship of wage with supplied labor? - [ ] Age-earnings profile - [x] Labor supply curve - [ ] Price elasticity curve - [ ] Demand-supply curve > **Explanation:** The labor supply curve depicts the relationship between wages and the quantity of labor supplied, not the earning trend over age. ### The etymology of age-earnings profile connects closely with: - [x] Human capital theory in labor economics - [ ] Financial market trends - [ ] Real estate development - [ ] Technological innovation > **Explanation:** The concept emerged from human capital theory, explaining earnings changes through experience and skill accumulation. ### Wage dynamics are studied using: - [x] Age-earnings profiles and other labor economics tools - [ ] Inflation data only - [ ] Military spending reports - [ ] Maritime trade data > **Explanation:** Wage dynamics use multiple tools from labor economics, including age-earnings profiles, to comprehend earning changes. ### Climbing the career ladder is an idiom that could be associated with: - [x] Increasing earnings over time - [ ] Immediate high earnings - [ ] Wage stagnation - [ ] Suddenly decreasing earnings > **Explanation:** The idiom "climbing the career ladder" reflects the gradual increase in earnings usually seen as a worker advances in their career. ### Which organization provides data helpful for constructing age-earnings profiles? - [x] The United States Census Bureau - [ ] NASA - [ ] Federal Aviation Administration (FAA) - [ ] Environmental Protection Agency (EPA) > **Explanation:** The United States Census Bureau offers comprehensive data on wages, demographic characteristics, and other factors pertinent for constructing these profiles.