midi51 发表于 2013-5-16 20:02 
跟购买股票债券一毛钱关系也没有。
也就是说你出口所得，无论是再用于进口也罢、用于对外金融投资也罢 ...
When a U.S. resident buys stock in Telmex, the Mexican telecommunications company, the purchase increases the first term on the right side of this equation and, therefore, increases U.S. net capital outflow. When a Japanese resident buys a bond issued by the U.S. government, the purchase increases the second term on the right side of this equation and, therefore, decreases U.S. net capital outflow.
The flow of capital between the U.S. economy and the rest of the world takes two forms. If McDonald’s opens up a fast-food outlet in Russia, that is an example of foreign direct investment. Alternatively, if an American buys stock in a Russian corporation, that is an example of foreign portfolio investment. In the first case, the American owner (McDonald’s Corporation) actively manages the investment, whereas in the second case, the American owner (the stockholder) has a more passive role. In both cases, U.S. residents are buying assets located in another country, so both purchases increase U.S. net capital outflow.
---------------------<Principles of Economics, International Edition, 6th Edition>
这段是原文，购买股票和债券属于outflow的一部分不是我杜撰的。。。
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