Managing aggregate demand is governments’ job. While Say’s law – the view that supply creates its own demand – is false in theory, it is true enough in practice that entrepreneurs and enterprises can and do depend on it.
调控总需求是政府的职责。尽管萨伊定律——供给创造需求——在理论上被证明是错误的，但毫无疑问，企业家和创业者在实际中却仍然遵循着这一准则。