Quotes Uncovered: Wit and Wisdom from Economics and Finance

Continuing with my requests for famous quotations and sayings that might make it into the next edition of The Yale Book of Quotations, I’d like now to ask for memorable recent (or not-so-recent) words of wit or wisdom from the realms of economics and finance. These could be theoretical insights, sound-bites from the economic crisis of the past few years, or proverbial maxims.