Coruscation

Andy Haldane, the-regulator-who-explained.

Also: Andrew Haldane asks "Is the world becoming more short-sighted?" (Bank of England)

Under one equilibrium, patience wins the day. When long-term investors start in the ascendency, prices tend to correct towards fundamentals. The performance of untested investors pursuing momentum strategies falters, while those pursuing longterm strategies flourish. The fraction of long-term investors rises. The self-correcting tendencies of market prices are thus reinforced, further supporting long-term investors. The patience gene thrives, the impatience gene dies. Natural selection results in a self-improving cycle, as with dieting, happiness and exercise.

But there is a second equilibrium where this cycle operates in reverse gear. With a large fraction of momentum traders, prices deviate persistently from fundamentals. Among untested investors, momentum strategies now flourish while long-term fundamentalists fail. The speculative balance of investors rises, increasing the degree of misalignment in prices. The patience gene falls into terminal decline. Natural selection results in a self-destructive cycle, as with drug, alcohol and food addiction.