This is likely to put severe pressure on China's fast-growing ports, says a joint study by Drewry and APL, a shipping line.

ECONOMIST: On a roll

In the past, says Drewry Shipping Consultants, the container trade has increased by between two-and-a-half and three times the rate of GDP growth.

ECONOMIST: On a roll

Drewry Shipping Consultants estimates that nearly half the ships due to be delivered last year are still sitting on the slipway or the drawing board.

ECONOMIST: Shipping in the downturn