xBookUtils.terms['fn_6_501'] = "For more on this topic, see Catherine L. Mann, Is the U.S. Trade Deficit Sustainable? (Washington, DC: Institute for International Economics, 1999).";
xBookUtils.terms['fn_6_502'] = "For more on this topic, see Robert E. Lucas, “Why Doesn’t Capital Flow From Rich to Poor Countries?” American Economic Review 80 (May 1990): 92–96.";
xBookUtils.terms['fn_6_503'] = "To learn more about purchasing-power parity, see Kenneth A. Froot and Kenneth Rogoff, “Perspectives on PPP and Long-Run Real Exchange Rates,” in Handbook of International Economics, vol. 3, edited by Gene M. Grossman and Kenneth Rogoff (Amsterdam: North Holland, 1995).";