Steven Pinker explains how capitalism is killing war – Vox
Yes, it’s one of the causes. It’s the theory of the capitalist peace: when it’s cheaper to buy things than to steal them, people don’t steal them. Also, if other people are more valuable to you alive than dead, you’re less likely to kill them. You don’t kill your customers or your lenders, so the arrival of the infrastructure of trade and commerce reduces some of the sheer exploitative incentives of conquest.