The Hidden Force Keeping Your Paycheck Small
Most of us have heard of a monopoly — one company dominating a market, squeezing out competition, and charging customers whatever it wants. Standard villain stuff. But there's a quieter, less talked-about version of the same problem, and it operates on the other side of the transaction. Instead of one powerful seller, imagine one powerful buyer. And in the labor market, the buyer is your employer.
This is called monopsony — and understanding it might change how you think about your wages.
A Word Born Over Tea
The concept has an unlikely origin story. In the early 1930s, a young economist named Joan Robinson was having tea near Cambridge University with a scholar of ancient Greek. Robinson was working on her first book and had run into a problem: she needed a word.
She knew that "monopoly" — derived from Greek, meaning "one seller" — described a market cornered by a single supplier. But what about a market cornered by a single buyer? There was no word for it. So she invented one. Together with her tea guest, she combined Greek roots to coin "monopsony": one buyer.
Robinson's book, The Economics of Imperfect Competition, went on to be translated into more than a dozen languages and helped establish her as one of the most influential economists of the 20th century. But the concept of monopsony she introduced would spend most of the following decades collecting dust.
What Economics Textbooks Got Wrong
To understand why monopsony matters, it helps to know what the standard economic model assumes about work and wages.
In a perfectly competitive labor market, the story goes like this: countless employers compete fiercely for workers. If your boss pays you too little or treats you badly, you simply leave and find something better. This competition keeps wages fair and working conditions decent. No single employer has the power to set wages — the market does it for them, automatically, like an invisible hand.
It's a tidy picture. And it leads to a very specific prediction: if the government steps in and forces wages higher with a minimum wage law, employers will hire fewer people. Wages go up, jobs disappear. This was treated almost as a law of nature by mainstream economists for decades.
Then, in the early 1990s, two economists named David Card and Alan Krueger ran a study that complicated everything. They looked at what happened to fast food employment in New Jersey after the state raised its minimum wage. According to the standard model, job losses should have followed. They didn't. Employment barely budged.
Card would eventually win a Nobel Prize, partly for this work. But in the short term, it forced economists to ask an uncomfortable question: if the standard model was right about how labor markets work, why didn't the evidence match?
When Employers Hold the Power
The answer, increasingly, is monopsony.
The economist Arindrajit Dube lays this out in his recent book, The Wage Standard. His argument is that employer power over wages is far more common than most people — including most economists — have assumed. And that this hidden power is a major reason wages have stagnated and inequality has widened in America since the 1980s.
"The truth is employers have a lot of real power over setting wages," Dube writes, "and when that power goes unchecked, paychecks stay smaller than they should be."
But how can employers have outsized power in a market where there seem to be plenty of jobs available? Dube points to three overlapping reasons.
First, labor markets are more concentrated than they look. When you zoom in on specific types of jobs in specific places, the number of employers actually competing for those workers tends to be surprisingly small. Dube's research suggests that for the typical American worker, the effective number of competing employers is roughly three. Three. That's not a competitive market — it's barely a choice.
Second, changing jobs isn't easy. Even if better-paying jobs exist somewhere, switching to them takes real effort. You have to search, apply, interview, wait, risk rejection, and then navigate a transition. These friction costs — time, stress, uncertainty — give employers breathing room. Workers don't instantly flee to better options the way a tidy economic model would predict. That inertia is worth money to employers who know how to exploit it.
Third, jobs aren't interchangeable. Your current job might have qualities that are hard to price: it's close to home, you like your team, and the hours work around your kids' school schedule. These personal factors create a kind of loyalty that has nothing to do with pay, and employers benefit from it. Just as brand loyalty lets cereal companies charge a little more for Cheerios than a generic alternative, worker attachment gives employers some room to pay a little less.
When Employers Collude
Beyond these structural factors, employers sometimes actively cooperate to suppress worker options — often illegally.
One example Dube highlights: in the early 2000s, Apple, Google, and other Silicon Valley giants had a secret agreement not to recruit each other's engineers. If you worked at Apple, Google wouldn't call you. The arrangement kept workers from learning their true market value and from jumping to better offers.
This came to light during a federal investigation. Among the evidence uncovered was an email from Steve Jobs to Google's CEO Eric Schmidt, asking him to stop a recruiter from approaching Apple employees. Google complied — and fired the recruiter responsible. When Jobs learned of the firing, his response was a single character: :)
These arrangements — known as no-poaching agreements — are now illegal. But the fact that they existed at all, at some of the most powerful companies in the world, tells you something about how employers think about labor markets when no one is watching.
Why It Matters for Inequality
Once you accept that employers routinely hold power over wages, the story of American inequality starts to look different.
For the past 40 years, wages at the bottom and middle of the income distribution have grown slowly while pay at the top has soared. The standard explanation centers on technology and globalization — forces that reward skilled workers and punish those whose jobs can be automated or offshored. Those factors are real. But Dube argues they don't tell the whole story.
Monopsony power helps explain why companies in identical industries with nearly identical workforces pay very differently. UPS and FedEx run the same routes with the same trucks through the same neighborhoods — but UPS pays considerably more. Walmart and Target compete in the same retail market for similar workers, but Target pays considerably more. In a truly competitive labor market, those gaps shouldn't persist. Workers would flow toward the higher-paying employer until wages equalized. The fact that they don't suggests employers have more control over wages than we've been told.
What changed in the 1980s? The checks on that power eroded. The federal minimum wage stopped keeping pace with inflation. Antitrust enforcement became more lax. Union membership collapsed. And a shift in corporate culture made shareholder returns — not worker welfare — the dominant priority in boardrooms.
"It was the result of choices," Dube says, "by corporations, by policymakers, and by experts, including economists who told us too often that markets were working just fine."
What Can Be Done
The picture isn't entirely grim. Dube points to signs that the balance of power can shift — and has.
Over the past decade, states and cities have raised minimum wages independently of the federal government, lifting pay for millions of low-wage workers with fewer job losses than the old models predicted. Pressure campaigns and union organizing have pushed companies like Amazon to raise their minimum wages voluntarily. The political momentum behind the "Fight for $15" — once dismissed as wildly unrealistic — led to real wage increases at some of the country's largest employers.
Dube's broader prescription includes strengthening collective bargaining, potentially by adopting "sectoral bargaining" — a model used in many European countries where wages are set at the industry level rather than company by company. Instead of individual workers negotiating alone against a well-resourced employer, entire sectors would set wage floors together.
The through-line in all of these ideas is the same: wages are not simply the neutral output of supply and demand. They are shaped by power — by who has it, who doesn't, and what rules govern how it gets used.
Joan Robinson understood this nearly a century ago, over a cup of tea in Cambridge. It took the rest of economics a very long time to catch up.