金融科技、劳动力市场与工资不平等：来自即时支付系统的证据
Financial Technologies, Labor Markets, and Wage Inequality: Evidence from Instant Payment Systems
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中文总结 AI 辅助
本文以巴西Pix系统推出为背景，运用三重差分设计，发现即时支付系统可通过降低支付摩擦、提升小型企业工资，减少工资分布下半部分的工资不平等。
中文摘要 AI 辅助
尽管技术创新通常会通过偏向熟练工人来加剧工资不平等，但本文表明即时支付系统（instant payment systems）反而会降低工资不平等。我们以巴西推出Pix系统为背景，研究即时支付系统对劳动力市场的影响。我们运用匹配的雇主-雇员数据，采用三重差分设计，利用各城市在Pix推出前的移动渗透率、Pix对小型与大型企业的差异化益处以及Pix的推出时间来识别因果效应。研究发现，Pix推出后，小型企业的工资相对于大型企业显著上升，这些收益集中在零售和服务等现金密集型行业，而在批发或制造业中未发现此类效应。关键的是，工资不平等有所下降，这一变化由工资分布下半部分的工资增长驱动，上半部分未受影响。我们的证据表明，小型企业的劳动力需求增加，这与支付摩擦降低的情况一致，且在低技能劳动力稀缺的地区，这些效应会被放大。校准的垄断竞争模型表明，若全面采用Pix，将降低工资不平等的组内和组间成分，从而放大总体不平等的减少幅度。
英文摘要
While technological innovations typically increase wage inequality by favoring skilled workers, we show that instant payment systems instead reduce it. We study the labor market effects of instant payment systems in the context of Brazil's Pix rollout. Using matched employer-employee data, we implement a triple-difference design that exploits pre-Pix mobile penetration across municipalities, the differential benefits of Pix for small versus large establishments, and the timing of Pix. We find that wages in small establishments rise significantly relative to large establishments after Pix. These gains are concentrated in cash-intensive sectors such as retail and services, with no effects in wholesale or manufacturing. Crucially, wage inequality declines, driven by wage gains in the lower half of the distribution, with no effect at the top. Our evidence points to increased small-firm labor demand, consistent with lower payment frictions. These effects are amplified where low-skill labor is scarce. A calibrated monopsony model implies that uniform Pix adoption would reduce both the within- and between-municipality components of wage dispersion, amplifying the aggregate inequality reduction.
