 Additionally, Audi began building a $1.3 billion factory at San José Chiapa near Puebla in 2013.Mexico has a MXN 4.027 trillion retail sector (2013, about US$300 billion at the 2013 exchange rate) including an estimated US$12 billion (2015) in e-commerce.The largest retailer is Walmart, while the largest Mexico-based retailers are Soriana super/hypermarkets, FEMSA incl.