His peculiar gift was the power of holding continuously in his mind a purely mental problem until he had seen it through. - John Maynard Keynes

Obviously consumption-goods, taken as a whole, have in this sense the longest period of production, since of every productive process they constitute the last stage. Thus if the first impulse towards the increase in effective demand comes from an increase in consumption, the initial elasticity of employment will be further below its eventual equilibrium-level than if the impulse comes from an increase in investment. Moreover,

The appropriate time for the ultimate release of the deposits will have arrived at the onset of the first post-war slump.

[People] will do the rational thing, but only after exploring all other alternatives.