Internal Migration in the United States
研究了20世纪80年代以来美国国内移民的历史，发现移民率降至30年低点，并探讨了住房市场收缩和衰退等周期性因素的作用，但认为这些因素影响较小，最后与美国和其他发达国家进行了比较。
This paper examines the history of internal migration in the United States since the 1980s. By most measures, internal migration in the United States is at a 30-year low. The widespread decline in migration rates across a large number of subpopulations suggests that broad-based economic forces are likely responsible for the decrease. An obvious question is the extent to which the recent housing market contraction and the recession may have caused this downward trend in migration: after all, relocation activity often involves both housing market activity and changes in employment. However, we find relatively small roles for both of these cyclical factors. While we will suggest a few other possible explanations for the recent decrease in migration, the puzzle remains. Finally, we compare U.S. migration to other developed countries. Despite the steady decline in U.S. migration, the commonly held belief that Americans are more mobile than their European counterparts still appears to hold true.