In 1997, a group of economists studied New York City cab drivers and found something that made no sense. On days when fares were high — rainy days, convention days, days when every corner had a hand in the air — drivers quit early. The busier the city got, the sooner they went home.
This is not how supply and demand is supposed to work. Higher wages should mean more labor supplied. Econ 101 says so. But the cab drivers had a daily income target in their heads. Once they hit it, they were done. A good day just meant reaching the target faster.
Economists call this the backward-bending labor supply curve. It's one of those ideas that sounds technical but is actually deeply human. At low wages, yes, paying people more makes them work more. But past a certain point, the curve bends backward. More money per hour means people start buying something no store sells: their time back.
Think about it from two angles. There's the substitution effect — when wages rise, each hour of leisure becomes more expensive in terms of lost income, so you're tempted to work more. But there's also the income effect — when you're already earning enough, an extra dollar matters less than an extra hour on the couch, or at the park, or doing literally anything that isn't work.
At some wage, the income effect wins. The curve bends.
This shows up everywhere once you start looking. Countries that get richer tend to work fewer hours per year. The average French worker logs about 300 fewer hours annually than the average American did in 1950. Highly paid consultants often dream of downshifting. Lottery winners famously reduce their working hours, even the ones who swear they won't.
There's something almost philosophical buried in here. Classical economics assumes people are maximizing income. But people aren't maximizing income. They're maximizing something else — comfort, meaning, time with people they love, afternoons that belong to them. Money is just one input into that bigger equation, and it has diminishing returns.
The cab driver study has been debated and refined over the years. More experienced drivers, it turns out, are less likely to fall into target-based thinking. They recognize good days and lean in. But the core insight holds: money motivates until it doesn't. And the threshold is different for everyone.
This is probably the most optimistic thing economics has ever discovered. Somewhere inside every labor supply curve is a quiet confession that people value their lives more than their paychecks.
The real question is: do you know where your curve bends?