曼昆教授认为前苏联， 东欧国家的中央计划经济搞得不好是因为把市场这只看不见的手捆在了背后。

That prices are the instrument with which the invisible hand directs economic activity. Prices reflect both the value of a good to society and the cost to society of making the good.

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还有，这个全球的估计值并没有包含那些没有数据的国家，包括前苏联和其它的一些东欧国家。

Also, the global estimate does not include a number of countries for which data are not available. The missing countries include the USSR and other East European nations.

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