And Rostow tells us that all economies need to pass through five stages of growth: first, traditional society, where a nation's output is limited by its technology, its institutions and mindset; but then the preconditions for takeoff, where we get the beginnings of a banking industry, the mechanization of work and the belief that growth is necessary for something beyond itself, like national dignity or a better life for the children; then takeoff, where compound interest is built into the economy's institutions and growth becomes the normal condition; fourth is the drive to maturity where you can have any industry you want, no matter your natural resource base; and the fifth and final stage, the age of high-mass consumption where people can buy all the consumer goods they want, like bicycles and sewing machines -- this was 1960, remember.