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Will Favre retire?

Can Protrade, a stock market for athletes, be used to estimate the chance that an athlete will retire? The Protrade market has players "earn" dividends based on their on-field performance and theory indicates that, like a stock, their value would be equal to their discounted expected future dividends. A player's value goes to zero when they retire. If we look at the example of Brett Favre his price is around $87 and he has earned about $25 in dividends so far this season. He is clearly not going to come anywhere close to $87 for the remainder of this season, perhaps an indication that he won't retire, but sign with a new team. There are a couple of potential issues with this analysis. First, you can't short a player in Protrade, you can only buy and sell. Second, this assumes that the money supply is controlled, which Protrade says it does. Nonetheless, it looks like the market is signaling another season for Favre, after all he couldn't be worse than whovever is playing QB for Chicago this week, could he?

Alexadex

If  you are interested in technology market games, there is more out there than Yahoo's Buzz game. Alexadex is a similar market game that is based on the Alexa.com site.  I like the Alexa engine better, Fred Wilson had a discussion on the merits of Alexa recently, however the game is not set up give a prediction of what will be popular in the future like the Yahoo market. The price is just based on the daily reach on Alexa, not supply and demand for the shares based on future expectations. It is an important difference since the "wisdom of crowds" in a prediction market is expressed through supply and demand in the price.