The current age of globalization can be distinguished from the previous one (from 1870 to 1914) by the much higher mobility of capital than labor (in the previous age, before immigration restrictions, labor was at least as mobile as capital). This increased mobility has been the result of technological changes (the ability to move funds electronically), and the relaxation of exchange controls. The mobility of capital has led to tax competition, in which sovereign countries lower their tax rates on income earned by foreigners within their borders in order to attract both portfolio and direct investment. Tax competition, in turn, threatens to undermine the individual and corporate income taxes, which remain major sources of revenue (in terms of percentage of total revenue collected) for all modern states.
Avi-Yonah, Reuven S. "Globalization and Tax Competition: Implications for Developing Countries." Law Quad. Notes 44, no. 2 (2001): 60-5.