“…A number of empirical studies support these predictions, finding female wages increasing relative to men's in a variety of country contexts and cross-sectionally as well (Wood, 1991;Milner and Wright, 1998;Tzannatos, 1999;World Bank, 2001;Paul-Mazumdar and Begum, 2002;Nicita and Razzaz, 2003;Black and Brainerd, 2004;Oostendorp, 2009). However, there is also substantial evidence that the gender wage gap -both absolute measures of the gap and the proportion of the gap attributable to discrimination -have either persisted or widened as a result of trade and investment liberalization (Mehra and Gammage, 1999;Artecona and Cunningham, 2002;Berik et al, 2004;UNRISD, 2005;Busse and Spielmann, 2006;Braunstein and Brenner, 2007;Menon and Rodgers, 2009). …”