John Maynard Keynes thought that most economic decision-making occurs in ambiguous situations in which probabilities are not known. He concluded that much of our business cycle is driven by fluctuations in “animal spirits,” something in the mind – and not understood by economists.
凯恩斯认为，大部分经济决策都是在概率未知的模糊情况下做出的。他推论说，我们商业周期的大部分是受“动物精神”波动的推动所致，所谓“动物精神”是指不为经济学家所理解的精神力量。