This is a preliminary draft and may not have been subjected to the formal review process of the NBER. This page will be updated as the chapter is revised.
Any opinions and conclusions expressed herein are those of the author and do not necessarily represent the views of the U.S. Census Bureau. All results are from existing papers that were reviewed to ensure that no confidential information is disclosed. I thank Emek Basker, John Eltinge, Shawn Klimek, and Nikolas Zolas for helpful comments