In this July 13, 2017 photo, lettuce grows on a floating farm known as a "chinampa" in Xochimilco, Mexico City. Chinampa produce generally sells for 15 to 100 percent more than comparable goods at the enormous Central de Abasto, the go-to wholesale market for nearly all of Mexico City’s chefs that is so monolithic its competition sets prices across the country. (AP Photo / Marco Ugarte)
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