Generative AI and Entrepreneurship — Gupta/Qian/Simintzi/Sun (NBER, Apr 2026)
94,789 U.S. startups, sharp ChatGPT shock, clean diff-in-diff: fully exposed startups cut employment 7.5% within two quarters, driven entirely by separations, with displaced juniors taking six months to find lower-paying lower-exposure jobs and near-zero of them becoming founders. The mechanism isn't VC pressure or managerial skill — it's CS-degree founders cutting headcount four times harder than non-technical ones, which means founder technical capacity is now first-order in projecting how a firm restructures around AI. Aggregate employment is flat because new firm formation backfills the contraction, but composition shifts senior — the headline isn't "AI destroys jobs," it's "the apprenticeship system that turned juniors into seniors collapsed."