Axel Dreher, Seo-Young Cho, Eric Neumayer, 10 March 2011

According to the US Department of State, there are more than 12 million victims of human trafficking worldwide. This column presents a new index to measure the spread of anti-trafficking policies. It suggests they mainly diffuse across contiguous countries and main trading partners, due to externality effects, and also via political and cultural similarities, due to learning and emulation.