“..the ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is commonly understood. Indeed the world is ruled by little else. Practical men, who believe themselves to be quite exempt from any intellectual influences, are usually the slaves of some defunct economist. Mad men in authority,who hear voices in the air, are distilling their frenzy from some academic scribbler of a few years back.”                                          —John Maynard Keynes

“经济学家和政治哲学家的思想，无论在对的时候还是错的时候，都比通常所认识的更有力量。事实上，世界是由这些思想统治的。讲求实际的人们，自信在相当程度上可免受任何学理之影响，可是他们往往是某个已故经济学家的思想奴隶。掌权的疯子，凭空妄想，其狂想只不过来源于若干年前的拙劣学者。”

—约翰·梅纳德·凯恩斯