The Middleman Economy: How a $400 Billion Staffing Industry Built Its Fortune on Worker Instability

In the official narrative of the American staffing industry, temporary and contract labor serves a mutual purpose. Employers gain flexible access to talent without the overhead of permanent headcount. Workers gain entry points to companies that might otherwise be inaccessible, along with the freedom to move between assignments. The staffing agency, in this account, is a neutral facilitator—a matchmaker collecting a reasonable fee for a genuine service.

The data tells a more complicated story.

The United States staffing industry generated approximately $400 billion in revenue in 2023, according to figures from the American Staffing Association, making it one of the largest labor market intermediaries in the world. That figure reflects not just the wages passed through to workers but the substantial markup that agencies collect between what client companies pay and what workers receive. Understanding how that markup operates—and why it has proven so durable despite mounting evidence of its costs to workers—requires looking at the mechanics of an industry that prefers to operate with limited public scrutiny.

The Markup Mechanism

When a corporation contracts with a staffing agency to supply temporary workers, it pays a bill rate—the total hourly cost of that worker to the company. The worker receives a pay rate, which is the portion of that bill rate that reaches their paycheck. The difference, expressed as a percentage of the pay rate, is the agency's markup.

Industry markups vary by sector, skill level, and geography, but they typically range from 25 percent to 100 percent or more for general staffing, with specialized technical and professional placements sometimes carrying higher margins. A worker earning $20 per hour may cost the client company $30 to $35 per hour—a markup of 50 to 75 percent. The agency collects the spread.

This arrangement is not inherently improper. Agencies bear real costs: payroll processing, employer-side taxes, workers' compensation insurance, and the administrative overhead of recruiting and placement. But critics argue that the size of the spread, particularly in high-volume, low-wage temporary staffing, is disproportionate to the services rendered—and that the opacity of the markup structure prevents workers from evaluating whether the arrangement is in their interest.

"Most temp workers have no idea what the client company is actually paying for them," said one labor economist at a Midwestern research university. "They see their wage. They don't see the spread. And the agency has no incentive to show them, because the moment workers understand the economics, they start asking uncomfortable questions."

The Benefits Gap

The financial consequences of contract and temporary status extend well beyond hourly wages. The majority of temporary workers in the United States are not offered employer-sponsored health insurance, retirement contributions, or paid leave by their staffing agencies. Some large agencies have expanded benefits offerings in recent years, partly in response to state-level legislation and partly as a recruitment tool in a competitive labor market. But coverage rates remain substantially lower than those available to direct employees.

This gap compounds over time in ways that are difficult to fully quantify but devastating to individual workers. A temporary employee who works for three years without access to a 401(k) match, employer-subsidized health coverage, or paid sick leave is not simply earning less in any given week—they are accumulating less wealth, carrying more financial risk, and building a less stable foundation for retirement.

Research published by the Economic Policy Institute found that workers in alternative employment arrangements, a category that includes temporary, contract, and on-call workers, are significantly less likely to have access to employer-provided benefits than their permanently employed counterparts, even when controlling for industry and wage level. The staffing model, by design, concentrates the costs of those gaps on the workers least positioned to absorb them.

Fee Structures and Permanent Placement

For workers hoping to convert temporary assignments into permanent employment—a pathway that staffing agencies frequently advertise as a key feature of their model—the process often involves an additional financial layer. Many staffing contracts include conversion fees: charges that client companies must pay if they wish to hire a temporary worker directly before a specified period has elapsed, typically ranging from 90 to 180 days.

These fees can reach tens of thousands of dollars for skilled workers, creating a direct financial disincentive for client companies to offer permanent employment during the conversion window. Workers who perform well and are valued by the client may find themselves in an extended temporary status not because the company lacks interest but because the conversion fee makes direct hiring economically unattractive in the short term.

"The fee structure is supposed to compensate the agency for its placement work," said one HR director at a mid-size manufacturing company in Ohio. "But in practice, it just keeps good workers in limbo. We've had people on assignment for over a year because nobody wanted to pay the conversion fee."

Political Insulation and Lobbying

The staffing industry's durability in the face of mounting criticism is not accidental. The American Staffing Association and its member companies maintain a significant lobbying presence in Washington and in state capitals, directing resources toward defeating legislation that would extend benefits requirements to temporary workers, restrict the use of mandatory arbitration clauses in staffing contracts, or impose greater transparency on markup practices.

In California, where the Legislature has repeatedly attempted to extend labor protections to gig and contract workers, the staffing industry has been an active participant in opposing or narrowing the scope of reform efforts. Similar dynamics have played out in New York, Illinois, and Texas.

At the federal level, the classification of temporary workers as employees of the staffing agency rather than the client company—a legal structure that is foundational to the industry's model—has insulated client companies from responsibility for a range of labor law obligations. Efforts to revisit joint employer standards, which would extend greater liability to client companies for the working conditions of temporary workers placed by agencies, have faced sustained industry opposition.

The Long-Term Wealth Consequence

For workers who cycle through temporary and contract assignments across years or decades—a population that has grown substantially since the 2008 financial crisis and accelerated again during the pandemic-era labor market disruptions—the cumulative financial cost is substantial.

Without employer retirement contributions, without the equity appreciation available to permanent employees at growing companies, and without the income continuity that supports mortgage qualification and credit building, long-term contract workers frequently arrive at retirement age with significantly less accumulated wealth than their permanently employed peers. Studies of wealth accumulation by employment type consistently document this gap, which is most pronounced for workers in lower-wage temporary categories.

The staffing industry's argument—that it provides access and flexibility that workers value—carries some validity for a subset of the workforce: retirees supplementing income, students seeking short-term employment, and professionals who genuinely prefer project-based work. But for the millions of Americans who are in temporary status involuntarily, who would prefer permanent employment but cannot access it, the flexibility argument is a description of someone else's experience.

The $400 billion generated by this industry flows primarily upward—to agencies, to shareholders, and to the client companies that shed overhead by externalizing their workforce. The workers at the center of those transactions absorb the uncertainty that makes the system profitable.