问题描述：
英语翻译
First,we find no evidence that the positive association between international trade and income arises because countries whose incomes are high for other reasons engage in more trade.On the contrary,in every specification we consider the instrumental variables estimate of the effect of trade is larger than the ordinary least-squares estimate,often by a considerable margin.Section 2,subsection E,investigates possible reasons that the 4 estimate exceeds the ordinary least-squares one.
First,we find no evidence that the positive association between international trade and income arises because countries whose incomes are high for other reasons engage in more trade.On the contrary,in every specification we consider the instrumental variables estimate of the effect of trade is larger than the ordinary least-squares estimate,often by a considerable margin.Section 2,subsection E,investigates possible reasons that the 4 estimate exceeds the ordinary least-squares one.
问题解答：
我来补答展开全文阅读