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The Hidden Forces of Labor Market Power

When the Federal Reserve lowers the federal funds rate, the main idea is straightforward: cheaper credit boosts investment, increases consumer spending, and leads to more hiring. However, a complex bargaining power dynamic influences how much of this stimulus actually benefits workers. Research by Federal Reserve economist Bence A. Bardóczy and Wharton professors Gideon Bornstein and Sergio Salgado reveals a divide between firms that dominate local labor markets and those that compete for talent.

In their study, “Monopsony Power and the Transmission of Monetary Policy,” firms are categorized based on their share of the total wage bill in the market. Companies responsible for ten percent or more of the wage bill are termed high-monopsony firms, while the rest are low-monopsony firms. This classification shows how much a single employer can influence wages without losing workers to competitors.

Why is this important? A 25-basis-point cut in the policy rate not only reduces borrowing costs but also increases household disposable income, boosts demand for goods, and raises the marginal product of labor. In a competitive labor market, firms would rush to hire, driving wages up alongside the growing wage bill. However, the Wharton-Fed analysis shows a more uneven reality.

Low-monopsony firms—those with less control over wages—expand their wage bills about 50 percent more than high-monopsony firms in response to stimulus. This means that when the Fed tries to boost employment, the benefits are limited for employers with more leverage over workers.

The authors also note a broader economic impact: in markets dominated by a few powerful buyers (an oligopsonistic setting), the output response to monetary easing is about 24 percent weaker, and the productivity of additional labor declines. This suggests that the usual chain of policy rate → borrowing costs → investment → hiring → wages falters when labor market power is concentrated.

This means that when the Fed tries to boost employment, the benefits are limited for employers with more leverage over workers.

Monetary Policy: A Double-Edged Sword

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Traditional macroeconomic theory states that the Fed’s main tools—interest rates, balance-sheet operations, and forward guidance—aim for price stability and maximum sustainable employment. This “dual mandate” assumes a relatively uniform labor market where firms compete for workers equally. New evidence challenges this assumption.

When rates drop, the immediate effect is lower capital costs. Firms can finance projects more cheaply, and households benefit from reduced mortgage and credit costs. This increase in overall demand raises the marginal revenue product of labor, prompting firms to hire more. However, high-monopsony firms behave differently than the textbook model suggests. With fewer alternative employers, they can increase employment without raising wages significantly. This leads to a growing gap between output and compensation—a widening of the “monopsony wedge.”

In contrast, low-monopsony firms, operating in tighter labor markets, must compete for talent. Their hiring decisions respond quickly to labor costs, translating demand increases into higher wages. The 50 percent difference in wage-bill growth identified by the Wharton-Fed team highlights how the same policy can yield very different outcomes within the same economy.

This dual nature of monetary easing presents a paradox. Aggressive rate cuts aimed at boosting employment may unintentionally perpetuate wage stagnation for workers at dominant firms while inflating wages in more competitive sectors. While overall employment numbers may appear strong, the distribution of gains can be uneven, affecting inequality and consumer spending power.

Implications for Wage Growth and Employment Dynamics

The differing responses of high- and low-monopsony firms reshape the labor market in three key ways.

Uneven Wage Trajectories Workers at firms with modest market shares see faster wage growth during expansionary monetary policy.

1. Uneven Wage Trajectories

Workers at firms with modest market shares see faster wage growth during expansionary monetary policy. In contrast, employees at dominant firms experience only slight pay increases, even as their companies hire more. This divide can worsen existing income disparities, especially in industries where a few firms dominate, such as technology, retail, or manufacturing.

2. Productivity Gaps

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The IMF’s research on labor market power and monetary policy shows that oligopsonistic conditions not only weaken output responses but also hinder productivity gains. When firms hire more workers without raising wages, the productivity of new labor tends to decline, as firms do not need to match workers’ reservation wages with the value they create. Over time, this can diminish the efficiency gains that monetary stimulus aims to achieve.

3. Strategic Labor-Market Navigation

For workers, understanding the bargaining power dynamics in their industry is crucial for career strategy. In sectors with few dominant employers, employees may focus on mobility, skill diversification, or unionization to counteract monopsonistic pressures. Employers must also consider the risks of appearing to suppress wages, especially as public scrutiny of corporate pay practices increases.

Policymakers face a choice as well. One option is to pair traditional monetary tools with targeted labor-market reforms—strengthening collective bargaining, enhancing antitrust enforcement, or promoting wage transparency. These measures could improve the effectiveness of rate cuts by ensuring that stimulus benefits workers rather than just expanding the workforce of dominant firms.

Strategic Outlook: Aligning Policy with Market Power

The evidence points to a critical truth: the structure of labor markets significantly influences the impact of monetary policy. Ignoring this factor could lead to a situation where employment numbers improve, but real wages for many workers stagnate.

These measures could improve the effectiveness of rate cuts by ensuring that stimulus benefits workers rather than just expanding the workforce of dominant firms.

Future Fed strategies may need to include labor-market diagnostics as a standard practice. Real-time data on wage-bill concentration from payroll and firm disclosures could guide rate decisions. Additionally, a coordinated approach—combining accommodative monetary policy with structural reforms to reduce monopsony power—could lead to more sustainable and inclusive growth.

As the economy cycles through tightening and easing, the ongoing struggle between employers and employees will continue to shape the effects of monetary policy. Addressing this struggle may be the most effective tool left in the central bank’s arsenal.

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