Make trade not war?

Philippe Martin talks to Romesh Vaitilingam about his research with Thierry Mayer and Mathias Thoenig on the ambiguous relationship between globalisation and war – both civil war and war between states. They find that trade deters severe civil conflicts but fosters less severe ones. And trade created by regional trade agreements is pacifying in terms of wars between states, but greater overall openness has the opposite effect.