A sculpture of oil workers in Caracas, Venezuela. The country is heavily dependent on oil exports, and falling oil prices have had a ripple effect on the country's already troubled economy. Ariana Cubillos/AP hide caption

itoggle caption Ariana Cubillos/AP

A woman displays Cuban pesos, or CUP (right) and the more valuable convertible pesos, or CUC (left), in Havana Tuesday. Raul Castro's government announced that it will begin unifying the two currencies. AFP/AFP/Getty Images hide caption

itoggle caption AFP/AFP/Getty Images