TED video: social experimenting shows unexpected results

In the TED talk I watched today, a woman was talking about social experimenting to figure out whether relief towards haiti and other countries really helps. Africa needed kids to attend schools, immunizing, and a solution that either proves or disproves that people were more likely to use free items for the intended use.

In order to get more kids to attend schools they figured out that deworming the children for free gets mire kids to come to school. With immunizing, the woman figured out that
Bed tents are useful for screening out mosquitos that cause malaria. When she tried to figure out how to get people to use them properly, she estimated that people might use bedtents for fishing, for example. When the results showed, it said that people use them properly most of the time, and that people will accept buying them if the bedtents were 65 cents as well.