We exploit state variation in licensing laws to study the effect of licensing on occupational choice using a boundary discontinuity design. We find that licensing reduces equilibrium labour supply by an average of 17–27 per cent.

中文翻译：

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职业许可有多少进入壁垒？

我们利用许可法中的州差异来研究许可对使用边界不连续设计的职业选择的影响。我们发现许可平均减少了 17% 到 27% 的均衡劳动力供给。