Most high-income countries – the US, most of Europe, and Japan – are failing to invest adequately or wisely toward future best uses. There are two ways to invest – domestically or internationally – and the world is falling short on both.&nbsp;
新凯恩斯主义和供给学派就栽在第三个挑战上。大部分高收入国家——美国、欧洲大部和日本——投资不足，或没有明智地以未来最佳用途为目标投资。投资有两种——国内和国际——对世界而言，这两种投资都有所不足。