Talk:Wald's martingale

Geometric Brownian motion?
The process described in this article seems to be identical to the geometric Brownian motion. I wonder whether it would be a good idea to delete the article and (optionally) add to the geometric Brownian motion article a comment to the effect that in finance the process is sometimes also known as Wald's martingale? Jochen (talk) 11:04, 10 September 2013 (UTC)


 * I agree that what is described is simply geometric Brownian motion (which, as far as I know, no-one calls "Wald's martingale"). I suspect Wald's martingale refers to the exponential martingale. I will look into this at some point and correct the article if needed. Malparti (talk) 12:47, 23 June 2023 (UTC)
 * I've tried to fix this. Malparti (talk) 13:43, 24 June 2023 (UTC)