Immigration policy and fertility: Evidence from undocumented migrants in the U.S.
利用2005-2014年美国社区调查数据，研究发现移民执法力度增强使无证移民生育率下降5%，主要源于警察执法措施带来的不确定性。
Using the 2005–2014 waves of the American Community Survey –a period characterized by the rapid expansion of interior immigration enforcement initiatives across the United States, we evaluate the impact of a tougher policy environment on undocumented immigrants’ fertility. We find that a one standard deviation increases in enforcement lowers childbearing among likely undocumented women by 5%. The effect stems from police-based measures linked to increased deportations, which may raise uncertainty about the future of the family unit and its resources.