One reason is that investment may never reach its previous levels. If a service-based economy simply has less need for expensive fixed capital, why should we expect a return to the days when business investment was a strong component of demand?
一个理由是投资也许再也无法企及此前的水平。如果基于服务业的经济不再需要那么多昂贵的固定资本，为何我们还可以预期回报像商业投资仍是需求主要成分的时期那么高？应用是廉价的。