Abhijit Banerjee and Esther Duflo have an enlightening article on global hunger:
What we've found is that the story of hunger, and of poverty more broadly, is far more complex than any one statistic or grand theory; it is a world where those without enough to eat may save up to buy a TV instead, where more money doesn't necessarily translate into more food, and where making rice cheaper can sometimes even lead people to buy less rice.
(Hat tip: Cowen)