The economist Milton Friedman taught that superior products flourished and shabby ones died out when consumers voted emphatically with their dollars.

• 经济学家弥尔顿·弗里德曼说过，当消费者明确地用他们兜里的钱来决定对商品的取舍时，优质产品兴隆地发展起来了，劣质产品逐渐被淘汰。