The Effect of Contract Structure on Prediction Market Price Biases
Prediction markets add value when they produce unbiased forecasts. However, several prior studies find persistent biases when examining prediction market sides contracts. Sides contracts represent bets on whether the score differential between two teams in a contest will be greater or less than a stated value. We propose that inferences generated from examining Tradesports' sides contracts may be problematic because they are framed exclusively with respect to favorites. If a favorite-longshot (or reverse favorite-longshot) bias causes these deviations from rationality, it may be that non-sports-related (e.g., internal corporate) prediction markets assets do not suffer from the same shortcomings. To evaluate the generalizability of prior findings, we contrast the price efficiency of Tradesports' sides and totals contracts. In totals wagers, traders take a position on whether the combine score of both teams in a game will be above or below a stated value. We find that the fundamental structural differences between totals contracts and sides contracts partly determine differences in price efficiencies. Relative to those in the sides market, some price biases in the totals market are significantly smaller in magnitude, and others are absent altogether. Results indicate that contract structure plays a significant role in the ability of prediction markets to produce unbiased estimates.
Volume (Year): 3 (2009)
Issue (Month): 3 (December)
|Contact details of provider:|| Web page: http://www.ubpl.co.uk/|
|Order Information:|| Web: http://www.predictionmarketjournal.com/index_files/Page418.htm Email: |
When requesting a correction, please mention this item's handle: RePEc:buc:jpredm:v:3:y:2009:i:3:p:1-12. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Victor Matheson, College of the Holy Cross)
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If references are entirely missing, you can add them using this form.
If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.
Please note that corrections may take a couple of weeks to filter through the various RePEc services.