In Keynes’s time, physicists were first grappling with the concept of quantum mechanics, which, among other things, imagined a cosmos governed by two entirely different sets of physical laws: one for very small particles, like protons and electrons, and another for everything else. Perhaps sensing that the boring study of economics needed a fresh shot in the arm, Keynes proposed a similar world view in which one set of economic laws came in to play at the micro level (concerning the realm of individuals and families) and another set at the macro level (concerning nations and governments).
