The long run is a misleading guide to current affairs. In the long run we are all dead. Economists set themselves too easy, too useless a task if in tempestuous seasons they can only tell us that when the storm is past the ocean is flat again.
——John Maynard Keynes, A Tract on Monetary Reform, 1923, Ch. 3
抨击了古典经济学的政策无效论