Globalization and modernization transformed the Mexican retail sector over the last two decades. One result is that Wal-Mart has become Mexico's dominant retailer. Another is the poor quality of jobs in the Mexican retail sector. Drawing on a variety of data sources, we review changes and current patterns in the characteristics and quality of retail jobs in Mexico. Retail jobs are worse than the Mexican average. Union coverage is widespread but offers little benefit to workers. Unlike the case in the United States, Wal-Mart offers unionized jobs very similar in quality to those of other retailers; indeed, in general we find little difference between the jobs of global and domestic Mexican retailers. Globalization and modernization have left Mexican retail workers with lousy jobs and invisible unions.