[1] Fed Reserve Bank Atlanta, 1000 Peachtree St NE, Atlanta, GA 30309 USA
[2] Georgetown Univ, Dept Econ, Intercultural Ctr, 580 37th & O St NW, Washington, DC 20057 USA
[3] Columbia Univ, 420 W 118 St MC 3308, New York, NY 10027 USA
[4] NBER, 420 W 118 St MC 3308, New York, NY 10027 USA