Prediction Markets = Collective Forecasting = Collective Intelligence That Predicts

Author Archives: Eric Zitzewitz

VP conditional probabilities

BetFair is running markets on both who will be the next vice president and who will be nominated by the two parties.
As we’ve discussed before in other contexts, one can divide two probabilities like these to obtain a conditional probability: e.g., if the Democrats put X on the ticket, they will win the general [...]

If Musharraf goes, should we celebrate?

Benazir Bhutto made a compelling case in the Sunday New York Times that she would be a better partner for the West than Musharraf. As she noted, $10 billion in U.S. aid since 2001 has not resulted in the elimination of Al Qaeda’s base there. There seems to be substantial reason to believe that Pakistan [...]

Volumes on InTrade are way up from 2004.

Just thought this might interest some of you:

Total volume in 2004 Democratic nomination markets: $5.2 million (data is taken from a talk I gave in San Diego)
Volume in 2008 Dem and GOP nomination markets (with 7 months to go before the primaries start): $24 million

Update:

CFM asks below whether the higher cumulative volumes on the 2008 [...]

Is Manipulation Good for a Prediction Market? Accuracy Isn’t Everything.

Michael Giberson made a point in a recent post that is worth repeating:
“I think the potential for manipulation troubles some prediction market folks because it puts an implied asterisk next to any prediction market price that says “caution: the price you currently observe in this market may not truly represent the collective opinion of [...]

An Employee Stock Option Prediction Market

Floyd Norris writes that the SEC is considering allowing firms to expense their employee stock options using valuations from a small-scale auction run by Zions Bank.
Early auctions have yielded values way below Black-Scholes and other methods. Norris is skeptical that these auctions are just a trick to help companies underexpense their options. He [...]

Manipulation can affect prices.

For the last two weeks a very interesting manipulation has been going on in Intrade’s “Hillary Clinton for President” contract.
1. The contract had been trading between 23 and 26 all year. It has consistently been about half the price of the “Hillary to get nominated” contract price. This ratio implies that, conditional [...]

XM-Sirius merger

So at Justin’s and my suggestion, Intrade has just listed a contract on whether the XM-Sirius merger will close.
(We’ve been waiting for a nice, juicy, controversial merger like this ever since Hp-Compaq.)
Interestingly, the MM has it at 60 bid/70 ask to close by June 08, but if you look at the stock prices of XMSR [...]

Thoughts on Weather Bill

See this article on the new firm, which will offer daily weather prediction market-like contracts on temperature and precipitation (our host mentioned them earlier today).
A couple thoughts:
1. I really don’t see that many accredited investors having so much exposure to daily weather risk that they’ll feel the need to hedge at prices they’ll assume [...]

Prediction Markets for the CFO

Here is the presentation I am about to give at the Yahoo confab. In my 10 minutes, I’m going to describe some recent work with Erik Snowberg and Justin Wolfers on financial market responses to the 2004 and 2006 elections. We use a method we call a Prediction Market Event Study — which [...]

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