Marshall’s economics has had a marvelous run, and has helped economists make sense of the world. Yet there is a sense that progress and understanding will require something new – an economics of virtuous circles, thresholds, and butterfly effects, in which small changes have very large effects.
马歇尔的经济理论长期以来产生了极大的影响，也帮助了经济学家们认知世界。然而进步和理解似乎还需要新的东西——一种由良性循环、临界值和蝴蝶效应构成的经济理论，一种小变化能产生大影响的理论。