Richard Ngo takes on Bryan Caplan’s signaling theory of higher education — the idea that college degrees primarily signal intelligence, conscientiousness, and conformity to employers rather than building human capital. While Ngo agrees college is largely a waste of time and money, he argues Caplan’s framework is explanatorily insufficient. If employers just wanted signals of intelligence and conscientiousness, cheaper substitutes (standardized tests, coding interviews, self-taught portfolios) would have displaced degrees long ago. The conformity argument fares worse: it’s conceptually confused (conflating professionalism with conformity), unfalsifiable (any norm-following counts), and can’t explain why degree requirements emerged in the first place.
Key Insights
The strongest move is the observation that self-taught competence should signal more conscientiousness than degree completion, yet doesn’t substitute for it. This is genuinely hard for signaling theory to explain. Ngo’s reframe — that the workplace is a social equilibrium where “everyone nervously avoids appearing weird” rather than an optimizing market — points toward sociological explanations (Bourdieu, cultural capital, elite formation) over economic ones. The list of what employers actually care about (appearance, political correctness, deference hierarchies) is a useful empirical anchor.
Our Take
The critique is sharp but the positive alternative is deferred to a follow-up post, which weakens the piece. Ngo is convincing that signaling theory is incomplete, less convincing that economics can’t accommodate the social dynamics he describes — behavioral economics already models conformity cascades and employer irrationality. The real question is whether “sociological” and “economic” are genuinely different explanatory frameworks here or just different vocabularies for the same equilibrium. Still, the core observation — that the persistence of degree requirements despite cheaper alternatives is the phenomenon to explain — is well-targeted and underappreciated.