"Manufacturers of food try to get the optimal ratio to tap into your impulsivity. They don't care abo..." — Robert J. Shiller

In a bubble, eventually people start saying, 'Wait a minute... these prices are way too high! What is anyone buying anymore? What could they possibly be thinking?' And then there's a correction and a bursting.

One should have a wide variety of assets in one's portfolio. And oil, by the way, is a particularly important asset to have in one's portfolio because we need it, and the economy thrives on it.

Critics of 'economic sciences' sometimes refer to the development of a 'pseudoscience' of economics, arguing that it uses the trappings of science, like dense mathematics, but only for show.

Since the global financial crisis and recession of 2007-2009, criticism of the economics profession has intensified. The failure of all but a few professional economists to forecast the episode - the aftereffects of which still linger - has led many to question whether the economics profession contributes anything significant to society.