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Posted by kqr 1 day ago

Looking at the data behind prediction markets(asteriskmag.com)
109 points | 39 commentspage 2
ghaff 14 hours ago|
I dove into the prediction markets rabbit hole a number of years back. And I’ve personally seen witnessed scenarios where the wisdom of crowds seems to really work. What I have not really—including in this piece—read is rigorous theory of what makes it effective or not. There are hints here and in the Wisdom of Crowds book but I’ve never read a really comprehensive theory.
ddp26 12 hours ago||
Author here. Hal Varian pointed me to this 1992 paper, which I think is still considered the canonical empirical piece on what is actually going on in trading behavior that leads to accuracy (or not): https://www.jstor.org/stable/2117471
chadgpt2 14 hours ago||
Insider trading is a part of it. If someone bets a few billion dollars that America will invade Iran, the probability shoots up to 98%, even though nobody else thinks it will happen. They can then run a press release about how their platform predicted the invasion before anyone else did.
ghaff 14 hours ago||
These were Oscar predictions and similar. So no insider trading and, when I wrote about, the prevalence of major prediction sites on the Internet seemed to degrade the crowd wisdom because so many people just went with what a few sites were picking.
Beijinger 12 hours ago||
Most people don't know, that "prediction markets" are acutally based on an idea by DARPA in 2002, after 9/11/2001.
jonahx 12 hours ago||
Prediction markets, by any reasonable definition, existed long before 2002.
ddp26 12 hours ago||
Yeah. People have put together a Prediction Market Database [1] (in a Google sheet), I think it's pretty well sourced and shows a good number of both real money and play money prediction markets from before 2002.

DARPA did have a big role though, too.

[1] https://docs.google.com/spreadsheets/d/1vGjnJPxdnBKwag3Q9Uy_...

nullc 7 hours ago||
> Most people don't know, that "prediction markets" are acutally based on an idea by DARPA in 2002, after 9/11/2001.

Did they then use a time machine to go back to the mid-90's to pass the idea to Jim Bell so he could take the fall for some of the less attractive possible outcomes?

PedroBatista 8 hours ago||
Good source.

The only complain I have ( not really directed at the article, but.. ) is to put all these theories and somewhat private experiments into the same room as pure gambling schemes turbocharged by "the algorithm" and political corruption.

While far from Heaven's gates, some guy trying to predict the price of corn next year is not in the same plane as those who had the "very original" idea every guy in his early 20s had at some point but never went further because he read some articles about "the law". Like it or not, the laws or the remnants of it were put in place due to the obvious degenerate attitudes and it's consequences gambling was always known for.

And no, it's not a "market", even Uber appears to have some usefulness to offset all the lying, corruption and criminality they had to do in order to become what they are. These ones don't even take you places other than gambler addiction.

End of run, sorry.

iammrpayments 7 hours ago||
Did I just read a claude ad?
SamTinnerholm 5 hours ago|
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