The favoured tools for exploring seemingly odd behaviours are called public-goods experiments and ultimatum games.

ECONOMIST: Human behaviour

Apart from barter by Kashmiris and the odd trainload of cargo at Wagah, goods went via third-country ports, notably Dubai and Colombo.

ECONOMIST: India and Pakistan: Clever steps at the border | The

Stanley Kubrick might have been odd, but in the end he delivered the goods, and such goods.

ECONOMIST: Stanley Kubrick | The

How odd that after decades of obsessing over all the goods the Japanese wanted to sell to America, the next trade sticking point could turn out to be something they want to buy.

WSJ: Business Asia: Japan's New TPP Energy