We come up with a value based upon market prices at the time.

我们根据当时的市场价格得出一个值。

At market prices, SGC gas is competitive in Turkey and south-east European countries but not in the more distant western European markets.

在市场价格上，SGC天然气在土耳其和欧洲东南部很具竞争力，但在更远的西欧市场则失去了竞争力。

Underestimating China's economy is hardly a new phenomenon. Since 1995 China's share of world GDP at market prices has risen from 2% to 16%, despite waves of Western scepticism.

低估中国经济不是什么新鲜事。尽管不断受到西方的质疑，但按市场价格计算，中国占世界GDP的比例已从1995年的2％上升到16％。