Investors have been relying on the Fed not just to revive the American economy but to prop up asset markets through its bouts of quantitative easing (QE).
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部分原因是美国的量化宽松政策:低息贷款将鼓励投资者尽其所能寻求更高的收益。
This is partly due to America's quantitative easing: cheap money will encourage investors to seek higher yields where they can find them.