The Labor Demand Curve is Downward Sloping: Reexamining the Impact of Immigration on the Labor Market
利用教育-经验组间的供给变化差异，估计移民对劳动力市场的影响，发现移民增加10%会使竞争性工人工资下降3%到4%。
Immigration is not evenly balanced across groups of workers who have the same education but differ in their work experience, and the nature of the supply imbalance changes over time. This paper develops a new approach for estimating the labor market impact of immigration by exploiting this variation in supply shifts across education-experience groups. I assume that similarly educated workers with different levels of experience participate in a national labor market and are not perfect substitutes. The analysis indicates that immigration lowers the wage of competing workers: a 10 percent increase in supply reduces wages by 3 to 4 percent.