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Spread betting is any of various types of wagering on the outcome of an event, where the pay-off is based on the accuracy of the wager, rather than a simple "win or lose" outcome, such as fixed-odds (or money-line) betting or parimutuel betting. A spread is a range of outcomes, and the bet is whether the outcome will be above or below the spread. Spread betting has been a major growth market in the UK in recent years, with the number of gamblers heading towards one million.[1] Spread betting carries a high level of risk, with potential losses or gains far in excess of the original money wagered.[2] In the UK, spread betting is regulated by the Financial Services Authority rather than the Gambling Commission.[3]
The general purpose of spread betting is to create an active market for both sides of a wager, even if the outcome of an event may appear a priori to be biased towards one side or the other. In a sporting event, for example, a strong team may be pitted against a historically weaker team. Persons betting on the event normally would be likely to favor the better team, to such an extent that there would be very few, if any, betting on the team perceived to be worse.
The use of a "point spread" evens out the market towards an equal number of participants on each side of the wager. This allows a bookmaker to make a market by accepting wagers on both sides of the spread. The bookmaker charges a commission and acts as the counterparty for each participant. As long as the size of wagers on each side is roughly equal, the bookmaker is unconcerned with the actual outcome; profits instead come from the commissions.
(taken from Wikipepedia.org)
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