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The Hidden Forces of Labor Market Power

When the Federal Reserve adjusts the federal funds rate, the effects on the economy are complex. Traditionally, interest-rate changes are seen as a uniform tool to influence aggregate demand, employment, and inflation. However, the actual impact varies across local labor markets, each with different power dynamics between firms and workers. In areas dominated by a few employers, monetary policy’s ability to boost hiring and wages is significantly reduced.

A study by Federal Reserve economist Bence A. Bardóczy and Wharton professors Gideon Bornstein and Sergio Salgado highlights how “monopsony” power affects the Fed’s strategies. They categorize firms that control at least 10% of the local wage bill as “high-monopsony” firms, while others are “low-monopsony.” Their research shows that after a 25-basis-point cut in the federal funds rate, low-monopsony firms increased their wage bills by about 50% more than high-monopsony firms.

This difference is significant and can hinder the Fed’s goals. When interest rates drop, households have more disposable income, and firms benefit from cheaper financing, leading to increased demand for goods and services. In a competitive labor market, firms would respond by hiring more workers and raising wages. However, in employer-dominated markets, firms can meet demand by extending hours or hiring slightly more staff without raising pay, which reduces the intended boost to household earnings.

How Monopsony Shapes Wage Growth and Employment

The Mechanics of Employer Dominance

Monopsony power arises when workers have limited job options, giving a single firm or a small group of firms control over wages. The Wharton study measures this power through wage-bill concentration. A firm that controls at least 10% of local wages can effectively set a “reservation wage” that influences the entire market.

When the Fed eases policy, increased consumer spending raises the marginal product of labor. Low-monopsony firms, competing for workers, must raise wages to attract the needed labor. In contrast, high-monopsony firms can meet demand by extending hours or hiring from underemployed individuals without raising wages, leading to a gap between productivity and compensation.

Low-monopsony firms, competing for workers, must raise wages to attract the needed labor.

Empirical Evidence from the Expansionary Episode

During the policy easing, low-monopsony firms increased their wage bill by about 1.5% of total payroll, while high-monopsony firms saw only a 1% increase. This means workers at low-monopsony firms experienced wage growth 50% larger than those at high-monopsony firms, even after accounting for industry, firm size, and regional cost of living.

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Employment trends mirrored wage changes. Low-monopsony firms added about 0.8% more workers than high-monopsony firms, highlighting how employer market power can disconnect demand shocks from job creation.

The Ripple Effects of Monetary Policy on Economic Stability

Dampened Output in Oligopsonistic Markets

Labor market power also affects overall economic output. The authors estimate that oligopsonistic competition—where a few dominant buyers control a market—reduces the impact of an expansionary rate cut on real output by about 24% compared to a market with balanced power. For instance, a policy that would typically raise GDP by 0.4% may only achieve a 0.3% increase in such markets.

This reduction occurs because lower wages limit consumer purchasing power, offsetting the benefits of cheaper credit. Additionally, when firms can hire without raising wages, the productivity gain from additional labor decreases, leading to inefficient resource allocation.

Implications for Inflation and the Fed’s Dual Mandate

The classic Phillips curve suggests that lower unemployment leads to higher inflation, relying on a strong link between labor market slack and wage pressure. Monopsony weakens this link. Even with modest employment growth, wages may remain low, reducing inflationary pressures. As a result, the Fed might misinterpret a strong labor market as a sign of impending price increases, leading to premature tightening.

Even with modest employment growth, wages may remain low, reducing inflationary pressures.

In high-monopsony environments, a rate cut may not produce the expected wage-driven demand, keeping inflation below target despite improved employment. This “policy-transmission gap” requires the Fed to look beyond unemployment rates and consider the distribution of labor market power.

Policy Levers Beyond Interest Rates

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To address the friction caused by monopsony, policymakers have two main options. First, they can enhance the Fed’s analytical tools by including measures of wage-bill concentration and employer market share in economic models. This will help the central bank adjust rate changes based on the labor market structure.

Second, reforms in antitrust and labor policies can reduce excessive employer concentration. Strengthening collective-bargaining rights, promoting worker mobility, and enforcing competition laws can weaken monopsony power, allowing monetary policy to more effectively influence wages and jobs.

Strategic Perspective for Workers and Policymakers

For individual workers, labor market power affects career outcomes. Employees in high-monopsony sectors, like certain manufacturing or tech niches, often see slower wage growth and less bargaining power, even in a growing economy. Conversely, workers in fragmented industries, such as hospitality or independent services, typically enjoy more significant pay increases following accommodative monetary policy.

From a policy perspective, the evidence suggests a more nuanced approach is necessary. Monetary policy alone cannot ensure fair wage growth if structural labor market issues persist. Integrating labor-market diagnostics into the Fed’s decision-making could prevent misinterpretations of economic signals. Additionally, targeted antitrust enforcement and labor law improvements can create a fairer environment, ensuring that lower rates benefit workers rather than just increasing employer profits.

Strategic Perspective for Workers and Policymakers For individual workers, labor market power affects career outcomes.

Critical Insights

• Labor-market power significantly influences the Fed’s transmission mechanism, affecting wage and employment outcomes.
• High-monopsony firms show modest wage increases—about 50% less than low-monopsony firms—and hire fewer workers.
• Oligopsonistic competition can reduce the expected output boost from a rate cut by roughly 24%, highlighting the economic cost of concentrated employer power.
• Policy frameworks that combine monetary tools with competition and labor reforms are most likely to promote economic stability and inclusive growth.

The Long-Term View

As the U.S. faces tightening labor markets and changing fiscal conditions, the relationship between employer concentration and monetary policy will become increasingly important. Evaluating the Fed’s rate decisions against labor-market concentration metrics could lead to a more effective approach to achieving price stability and full employment.

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Ultimately, understanding labor-market power shows that macroeconomic tools do not work in isolation. They are influenced by workplace dynamics, affecting millions of workers. Research from the Federal Reserve and Wharton offers insights for policymakers to build a more resilient and equitable economy