Sprea 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, which is known as money-line 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. As with all gambling, however, spread betting carries a high level of risk. In the UK, spread betting is regulated by the Financial Services Authority rather than the Gambling Commission.