Megan McGinnity has has studied child slavery in Ghana. She has examined how former child soldiers are being reintegrated into society in Rwanda. And she has studied the sex trade in Thailand, Singapore and Cambodia. The ASU honors student says that seeing these problems through the lens of economics helps explain peoples' incentives. She hopes that changing the incentive structure can help solve these and other daunting problems of human trafficking. (part 2 of 3) --by Sheilah Britton