In his latest column, Martin Wolf reviews Andrew Smithers’ latest book and uses the opportunity to jettison the Efficient Markets Hypothesis.
The efficient market hypothesis, which has had a dominant role in financial economics, proposes that all relevant information is in the price. Prices will then move only in response to news. The movement of the market will be a “random walk”. Mr Smithers shows that this conclusion is empirically false: stock markets exhibit “negative serial correlation”. More simply, real returns from stock markets are likely to be lower, if they have recently been high, and vice versa. The right time to buy is not when markets have done well, but when they have done badly. “Markets rotate around fair value.” There is, Mr Smithers also shows, reason to believe this is true of other markets in real assets – including housing. [More here]
Perhaps, Bibek Debroy should take a look at the book and these comments by Martin Wolf:
The era when central banks could target inflation and assume that what was happening in asset and credit markets was no concern of theirs is over. Not only can asset prices be valued; they have to be. “Leaning against the wind” requires judgment and will always prove controversial. Monetary and credit policies will also lose their simplicity. But it is better to be roughly right than precisely wrong. Pure inflation targeting and a belief in efficient markets proved wrong. These beliefs must be abandoned. [More here]