John Maynard Keynes

If human nature felt no satisfaction (profit apart) in constructing a factory, a railway, a mine or a farm, there might not be much investment merely as a result of cold calculation.

The General Theory of Employment, Interest, and Money

To Keynes (and the out-of-work millions) in 1936, laissez-faire was about as appealing as a breadline. Left alone, he said, a capitalist market economy does not necessarily lead to full employment. Rescuing economies requires regulation in the form of tax-and-spend and interest-rate finagling. Alan Greenspan may owe his job to this book. [Byron Wein Annotation]