MEXICO - DECEMBER 31: A taxi driver fills up his car&#039;s trunk at a gas station in Copilco avenue on December 31, 2016 in Mexico City, Mexico. Officials say it&#039;s time for Mexicans to pay market prices for gasoline and longtime subsidies are not sustainable. On Jan. 1, Mexicans will start paying increased market prices for gasoline as part of a price deregulation, triggering gasoline shortages in all the country. (Photo by Miguel Tovar/LatinContent/Getty Images)