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. Spread betting can carry a high level of risk, with potential losses or gains far in excess of the original money wagered. In the UK, spread betting is regulated by the Financial Services Authority rather than the Gambling Commission.