TY - JOUR AU - Hatton,Timothy J. AU - Williamson,Jeffrey G. TI - What Determines Immigration's Impact? Comparing Two Global Centuries JF - National Bureau of Economic Research Working Paper Series VL - No. 12414 PY - 2006 Y2 - August 2006 UR - http://www.nber.org/papers/w12414 L1 - http://www.nber.org/papers/w12414.pdf N1 - Author contact info: Jeffrey G. Williamson 350 South Hamilton Street #1002 Madison, WI 53703 Tel: 608-441-0023 Fax: 608-204-0783 E-Mail: jwilliam@fas.harvard.edu M2 - featured in NBER digest on 2006-08-07 AB - Can history shed light on the modern debate about immigration%u2019s labor market impact in high wage economies? This paper examines the relationship between migration and capital flows in the age of mass migration before 1914, the so-called first global century. It then assesses the effects of immigration on wages and employment with and without international capital mobility in first global century and today, that is, the second global century. The paper then explores the links between these economic relationships and immigration policy. It concludes with an explanation for the apparent difference in immigration%u2019s impact in the two global centuries, and thus on policy. ER -