The duty drawback system is allowed under the World Trade Organisation, and countries like America, Japan and China maintain it.

ECONOMIST: Letters: On speculation, free trade, Indian infrastructure, wheat rust, cyber-security, mental health, car insurance, General McChrystal | The

One drawback of a system that disperses risk is that nobody knows who has lost how much.

ECONOMIST: A liquidity squeeze

It is an obvious drawback of any self-reporting system.

BBC: Greeks fight back against corruption

The drawback of using plasma technology to clean exhausts has always been the extra power required to run the system.

ECONOMIST: Diesel engines