Discussion about this post

User's avatar
Noah Kreutter's avatar

This doesn't work as well as you think - financial markets tend to break when participants are optimizing for the probability of finishing in the top N, especially when N is small. If I were trying to maximize my probability of winning this tournament in a blended pool of rational and irrational agents, I would be:

1) taking way more risk than I would if my goal were simply to maximize my portfolio's returns

2) taking risks that give me different risk exposures from other participants, even if the arithmetic expectation isn't in my favor.

For example, if the true probability of an event happening is 90%, and various market participants bid it up from 50% to 88%, well, I am probably more likely to sell it than buy it at those prices. The intuition is that if the event resolves YES, I will have bought it at the worst price among all the people who bought YES, but if the event resolves NO then I will have sold it at the best price among the people who sold YES.

Requiring people to trade a variety of markets also doesn't do much - it's pretty easy for people to buy YES at 99% on a variety of already-basically-resolved markets to meet this requirement, especially when those markets will formally resolve quickly.

All in all I expect that this competition tests the skill of "how good are you at gaming formal systems" a lot more than it tests the skill of "how good are you at making well calibrated predictions about the world".

Source: I was a quantitative trader for 2 years and they made us play a bunch of games market trading games with solutions like these during training.

Skeptic's avatar

This is a clever idea for identifying individuals who have real expertise rather than just credentials.

There also needs to be a system for identifying institutions that foster (or at least identify and collect) individuals with real expertise, rather than foisting frauds on the world. We need an entirely new system for identifying elite institutions.

This was recently driven home when Yale Law students shut down a speaker they disagreed with by shouting and banging on walls, and the Dean took no action against them. Yale Law School does not appear to cultivate elite skills of reasoned debate. There are far less famous, scrappier schools that do a much better job.

19 more comments...

No posts

Ready for more?