If the government falls down on the job, John Maynard Keynes wrote 76 years ago, and “demand is deficient…the individual enterpriser...is operating with the odds loaded against him. The game of hazard which he plays is furnished with many zeros,” which represent “the increment [by which] the world’s wealth has fallen short of...savings,” owing to “the losses of those whose courage and initiative have not been supplemented by exceptional skill or unusual good fortune.