In the second half of the twentieth century, the idea became increas ingly dominant that attaining a superior growth rate and thus increased prosperi… - Adair Turner, Baron Turner of Ecchinswell

Economists should study financial markets as they actually operate, not as they assume them to operate—observing the way in which information is actually processed, observing the serial correlations, bonanzas, and sudden stops, not assuming these away as noise around the edges of efficient and rational markets.

Imperfect markets are different. (...) Similarly, in Paul Krugman’s neat adaptation, “all perfect markets are perfect in the same way: all imperfect markets imperfect in their own different way.” But truly perfect markets exist only in economists’ models; in the real world, markets are imperfect. But within imperfect markets there is a range from those that work well enough for a laissez-faire approach to be broadly valid to those for which market failure or imperfection is extreme and inherent. The market for restaurants works pretty well. The best way to ensure a range of restaurants that provide us with variety, incentives for good service, and enjoyment of changing ambience and menu is to let entrepreneurship do its business—let thousands of flowers bloom, some to succeed and some to wilt.

Economic history matters. Students of economics should read Charles MacKay and Charles Kindleberger, and should study the history of the Wall Street Crash as well as the theory and the mathematics required to formalize it.