What Is the Minimum Wage? The Economics of Pay Floors

What Is the Minimum Wage?

A minimum wage is the lowest wage that employers are legally required to pay their employees per hour worked. It is a price floor in the labor market — a legal minimum below which wages cannot fall. The policy objective is to ensure workers can afford a basic standard of living and to reduce poverty and inequality.

The first national minimum wage law was enacted in New Zealand in 1894. The United States federal minimum wage was established in 1938 under the Fair Labor Standards Act (FLSA) at $0.25 per hour. As of 2024, the U.S. federal minimum wage stands at $7.25 per hour — unchanged since 2009, one of the longest periods without an increase. Many states and cities have enacted higher minimum wages; some exceed $17–$18 per hour.

The Traditional Economic Argument

The classical economic model of labor markets predicts that a minimum wage above the market equilibrium wage will reduce employment. The logic:

1. Employers hire workers up to the point where the last worker's contribution (marginal product) equals the wage.
2. A higher minimum wage increases labor costs above this equilibrium.
3. Employers respond by hiring fewer workers, cutting hours, automating, or raising prices.
4. Result: unemployment among low-wage workers, the exact people the policy aimed to help.

This model predicts that any binding minimum wage creates unemployment — and long dominated economic thinking.

The Card-Krueger Revolution

In 1994, economists David Card and Alan Krueger published a landmark study comparing employment at fast-food restaurants in New Jersey (which raised its minimum wage from $4.25 to $5.05) with neighboring Pennsylvania (which did not raise its wage). Classical theory predicted employment would fall in New Jersey relative to Pennsylvania — but Card and Krueger found the opposite: employment actually increased slightly.

This study (and the large body of subsequent research it spawned) transformed the debate. Card received the Nobel Prize in Economics in 2021 partly for this work.

Modern Research: What Do We Know?

The research evidence is now considerably more nuanced than the classical model predicted:

• Moderate minimum wage increases generally show small or negligible disemployment effects for most workers.
• Very large and rapid minimum wage increases (like $15 in small markets with low prevailing wages) may have more significant employment effects, particularly for the most vulnerable workers.
• The monopsony model offers one explanation for why minimum wages can raise both wages and employment: when employers have market power over workers (workers cannot easily find alternative jobs), they can pay below competitive wages. A minimum wage that partially corrects this market failure can improve efficiency as well as equity.
• Effects differ significantly by local labor market conditions — a $15 minimum in San Francisco (where median wages are much higher) has different effects than $15 in Mississippi (where median wages are lower).

The Living Wage

The living wage is a related but distinct concept: the minimum income necessary for a worker to meet their basic needs (food, housing, healthcare, transportation, education for children) in a specific location, typically calculated without relying on government assistance. Living wages vary enormously by geography — MIT's Living Wage Calculator estimates a living wage for a single adult with no children in many U.S. cities to be $20–$25 per hour or more.

Many advocacy groups argue the federal minimum wage is insufficient to meet even basic needs in most American cities, and that the appropriate standard should be a living wage rather than an arbitrary floor.

Global Approaches

Countries take different approaches:

• United States: $7.25 federal floor with many higher state/local floors; tipped workers have a separate, lower minimum ($2.13 federal).
• United Kingdom: National Living Wage (for workers 23+) of £11.44/hour in 2024, adjusted annually by the Low Pay Commission.
• Australia: One of the world's highest national minimum wages at approximately $23.23 AUD/hour, set by the Fair Work Commission through annual reviews.
• Germany: Introduced a statutory national minimum wage only in 2015 (€12.41/hour in 2024 after rapid increases).
• Sweden, Denmark, Norway: No statutory minimum wage — wages set through collective bargaining agreements between unions and employer associations, resulting in high effective minimums through negotiation rather than law.

Arguments For and Against Higher Minimum Wages

For

• Reduces poverty and inequality by boosting incomes of the lowest-paid workers
• Increases consumer spending among low-income households (who spend higher proportions of income)
• Reduces reliance on government assistance programs
• Moderate evidence of small disemployment effects
• May improve worker productivity and reduce turnover

Against

• Risk of job losses, particularly for teenagers and low-skill workers
• May accelerate automation in labor-intensive industries
• Costs may be passed on to consumers through higher prices
• One-size-fits-all floor ignores variation in local labor market conditions
• May reduce benefits or hours alongside nominal wage increases

The minimum wage debate ultimately involves both empirical questions (what are the actual employment effects?) and normative questions (how should we balance worker incomes against potential employment costs?). The research consensus has shifted significantly toward recognizing that moderate minimum wage increases can improve worker welfare with limited adverse employment effects — but the debate over appropriate levels and implementation continues.