In this short note, we show investors one way to calculate ideal investment sizing by using two rules of thumb based on a simple outline of individual risk aversion. We illustrate these two heuristics, which are not widely appreciated, with thought experiments involving coin flips and ketchup &...

Hong, Kubik and Stein (JFE 2008) find that the price of a stock in the US is decreasing in the ratio of the aggregate book value of listed firms in a region to the aggregate personal income in the same region (“RATIO”), an “only-game-in-town” effect. We first replicate the HKS (2008)...

We model a financial market where some traders of a risky asset do not fully appreciate what prices convey about others' private information. Markets comprising solely such "cursed" traders generate more trade than those comprising solely rationals. Because rationals arbitrage distortions caused...