In this May 22, 2011 photo, a woman offers a bowl of potatoes in exchange for pears at a street market in Achacachi, Bolivia. Corn and sugar farmers worried as their crops withered last year during a drought that was the worst in 20 years. But the drought was only the start of their problems: farmers said they were hurt just as much by price controls that eliminated profits and by other government policies including farm seizures and restrictions on exports. (AP Photo/Juan Karita)