Well... there is the stock market, but that's generally too much of a challenge; any edge you get disappears very quickly, so the best thing to do is "free ride" off of other people's attempts to value stocks and just buy index funds (or the equivalent).

This is a great deal of how rationality wins in the real world in general: just being less wrong than other people.

(The epistemic hazard is how to avoid getting full of yourself on a win and considering yourself ridiculously more brilliant than anyone who hasn't had your particular revelation, rather than considering yourself someone who was less wrong in a particular area this time and who aims to be less wrong next time.)