Why a "useless" degree can still land you the job

Economists have a startling explanation for why people spend years and fortunes on credentials: sometimes the point isn't what you learn at all. In 1973, economist Michael Spence introduced signaling theory (it later won him a Nobel Prize). His insight: when an employer can't directly see how capable you are, a costly signal — like a hard-won diploma — can prove it even if the diploma taught you nothing useful for the job.

The trick is in the word costly. A signal only works if it's harder to fake for the people who shouldn't send it. Suppose a demanding degree is exhausting for a less-productive worker but manageable for a highly capable one. Then only capable workers find it worth completing — so finishing the degree reliably separates the two groups. The employer learns something true about you, not from the coursework, but from the mere fact that you survived it.

This is why information asymmetry — one side knowing more than the other — quietly shapes markets everywhere. A long warranty signals a carmaker's confidence in quality. A peacock's absurd tail signals genetic fitness precisely because it's a costly handicap. In each case the message is credible only because it would hurt too much for a low-quality sender to imitate.

The unsettling implication: part of what we pay for in education may be sorting, not learning — a mechanism to prove what we already are, rather than to become something new.