> Not sure I follow your reasoning. Prices are positive only, and non stationary. That is very much not the same for returns. Usually prices are log normal, lea

> Not sure I follow your reasoning. Prices are positive only, and non stationary. That is very much not the same for returns. Usually prices are log normal, leading to normal (log) returns. Perhaps we should take it back to the beginning. What do you believe "random variable" means...? > It is not said, but rather implied. I see.