Two years ago this month, Haiti was hit by an earthquake that the United Nations called “the largest urban disaster in modern history.”

Since then, the U.N. estimates that more than two billion dollars in aid has gone into the country. But despite the money, efforts to rebuild have been painfully slow.

Haitian economist Ludovic Comeau helps Worldview take stock of the complicated process of rebuilding Haiti. Ludovic is a professor of economics at DePaul University and the president of GRAHN-USA, a think tank dedicated to rebuilding the Caribbean nation.