wedrifid comments on Arbitrage of prediction markets - Less Wrong

6 Post author: taw 04 December 2009 10:29PM

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Comment author: wedrifid 05 December 2009 03:02:23AM *  0 points [-]

The whole point of these markets is to prevent the kind of arbitrage you're trying to figure out. You're supposed to have skin in the game. That's what makes them accurate.

He just thinks that people are buying contracts at the wrong price and is frustrated because the particular setup of the InTrade market is such that a large collateral is required to bet against this particular kind of stupidity. He is trying to have an appropriate amount of skin in the game and not trying to arbitrage against InTrade.

(Edited)

Comment author: bgrah449 05 December 2009 03:18:14AM *  -1 points [-]

It doesn't strike me as very sporting to edit a post to make it sound like I didn't address your point.

Comment author: wedrifid 05 December 2009 03:35:53AM *  1 point [-]

"Skin in the game" and "arbitrage" are mutually exclusive, and the title of the post is "Arbitrage of Prediction Markets."

It is probably not the best title. Intrade do not try to discourage the kind of thing taw is talking about.

Comment author: wedrifid 05 December 2009 05:20:26AM *  0 points [-]

It doesn't strike me as very sporting to edit a post to make it sound like I didn't address your point.

My reply to what used to be here was one of clear agreement with you and I marked the edit explicitly.

For the record, the edit was a remove "No, taw is trying to figure out a different kind of arbitrage". A more correct statement would perhaps be "No, taw is trying to figure out a different kind of thing than what you are talking about and which isn't really arbitrage at all". But that is a distraction from the gist of your post, which I disagree with for the reason stated.

I will, of course, take more care to acknowledge contributions by name when I add edit notes. I erred too far on the side of brevity here.