【求助】GWD12 Real Interest Rate -- 最后一句话不懂

JNC913

GWD12 的一篇阅读，题目没有问题，但是最后一句不是很理解：
Many economists believe that a high rate of business savings in the United States is a necessary precursor to investment, because business savings, as opposed to personal savings, comprise almost three-quarters of the national savings rate, and the national savings rate heavily influences the overall rate of business investment. These economists further postulate that real interest rates—the difference between the rates charged by lender and the inflation rates—will be low when national savings exceed business investment (creating a savings surplus), and high when national savings fall below the level of business investment (creating a savings deficit ).  However, during the 1960’s real interest rates were often higher when the national savings surplus was large.  Counter-intuitive behavior also occurred when real interest rates skyrocketed from 2 percent in 1980 to 7 percent in 1982, even though national savings and investments were roughly equal throughout the period. Clearly, real interest rates respond to influences other than the savings/investment nexus.  Indeed, real interest rates may themselves influence swings in the savings and investment rates.  As real interest rates shot up after 1979, foreign investors poured capital into the United States, the price of domestic goods increased prohibitively abroad, and the price of foreign-made goods became lower in the United States.  As a result, domestic economic activity and the ability of businesses to saveand invest were restrained.
这里的最后一句话中domestic economic activity 为什么是被restrain了呢？不是有些其他国外商品在国内卖得便宜了反倒能刺激消费吗？怎么理解这里的logic?

JNC913

请NN指教一下吧

woonvnv

domestic business activity指美国本土的生产活动，利率升高，吸引资本流入，推动原材料价格上升，造成生产成本压力，价格不如进口产品有优势，所以会逐渐倒闭。不知道对不对，供参考。

JNC913

理解成本国生产能力就说得通了，谢谢你！