This line of reasoning is particularly relevant to the US, given the extent of income concentration and the fiscal challenges that lie ahead. But the broad trend toward larger income shares at the top is global, and the difficulties that it may create for macroeconomic policy should no longer be ignored.
这条逻辑链对美国尤其适用，这是由该国收入集中度和所面临的未来财政挑战决定的。但收入比重向最顶端人群集中是一个全球性的大趋势，我们不能继续忽视其可能带来的宏观经济政策难题了。