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] Financial spread betting (see below) can carry a high level of risk if there is no 'stop'.^[2] In the UK, spread betting is regulated by the Financial Conduct Authority rather than the Gambling Commission.^[3]

6Financial spread betting
7Terminology and acronyms

Purpose[edit]

The general purpose of spread betting is to create an active market for both sides of a binary wager, even if the outcome of an event may appear prima facie to be biased towards one side or the other. In a sporting event a strong team may be matched up against a historically weaker team; almost every game has a favorite and an underdog. If the wager is simply 'Will the favorite win?', more bets are likely to be made for the favorite, possibly to such an extent that there would be very few betters willing to take the underdog.

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Teaser bets and Vegas teasers are gambling wagers that add extra points to sides or totals. Teaser bets are popular for NFL and NBA gambling. The sports betting odds for teaser bets are determined by the number of points by which each sports betting spread is moved and the number of teams included in the teaser.
Teasers are a popular form of betting that allow players to move the pointspread of wagers in their favor. In a standard teaser, a bettor must place at least two selections, both of which must win, and the player is given a cushion of a certain number of points on each leg.
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The point spread is essentially a handicap towards the underdog. The wager becomes 'Will the favorite win by more than the point spread?' The point spread can be moved to any level to create an equal number of participants on each side of the wager. This allows a bookmaker to act as a market maker by accepting wagers on both sides of the spread. The bookmaker charges a commission, or vigorish, and acts as the counterparty for each participant. As long as the total amount wagered on each side is roughly equal, the bookmaker is unconcerned with the actual outcome; profits instead come from the commissions.

Because the spread is intended to create an equal number of wagers on either side, the implied probability is 50% for both sides of the wager. To profit, the bookmaker must pay one side (or both sides) less than this notional amount. In practice, spreads may be perceived as slightly favoring one side, and bookmakers often revise their odds to manage their event risk.

One important assumption is that to be credited with a win, either team only needs to win by the minimum of the rules of the game, without regard to the margin of victory. This implies that teams in a winning position will not necessarily try to extend their margin—and more importantly, each team is only playing to win rather than to beat the point spread. This assumption does not necessarily hold in all situations. For example, at the end of a season, the total points scored by a team can affect future events such as playoff seeding and positioning for the amateur draft, and teams may 'run up' the score in such situations. In virtually all sports, players and other on-field contributors are forbidden from being involved in sports betting and thus have no incentive to consider the point spread during play; any attempt to manipulate the outcome of a game for gambling purposes would be considered match fixing, and the penalty is typically a lifetime banishment from the sport, such is the lack of tolerance for gambling in sport.

Spreads in sports wagering (U.S.)[edit]

Spread betting was invented by Charles K. McNeil, a mathematics teacher from Connecticut who became a bookmaker in Chicago in the 1940s.^[4] In North America, the gambler usually wagers that the difference between the scores of two teams will be less than or greater than the value specified by the bookmaker, with even money for either option. An example:

The bookmaker advertises a spread of 4 points in a certain game;
- If the gambler bets on the 'underdog', they are said to take the points and will win if the underdog's score plus the spread is greater than the favorite's score.
  - The eventual score is Underdog 8, Favorite 10: 8 + 4 > 10, so the gambler wins;
  - The eventual score is Underdog 8, Favorite 13: 8 + 4 < 13, so the gambler loses.
- If the gambler bets on the 'favorite', they give the points (sometimes called lay the points) and will win if the favorite's score minus the spread is greater than the underdog's score:
  - The eventual score is Underdog 5, Favorite 10: 10 – 4 > 5, so the gambler wins;
  - The eventual score is Underdog 8, Favorite 10: 10 – 4 < 8, so the gambler loses.
- Ties aka 'Push'
  - The eventual score is Underdog 9, Favorite 13: 9 + 4 = 13, so the gambler ties 'pushes'. The reverse is also the same the gambler takes the favorite and it is 13 - 4 = 9

Spreads are frequently, though not always, specified in half-point fractions to eliminate the possibility of a tie, known as a push. In the event of a push, the game is considered no action, and no money is won or lost. However, this is not a desirable outcome for the sports book, as they are forced to refund every bet, and although both the book and its bettors will be even, if the cost of overhead is taken into account, the book has actually lost money by taking bets on the event. Sports books are generally permitted to state 'ties win' or 'ties lose' to avoid the necessity of refunding every bet.

Betting on sporting events has long been the most popular form of spread betting. Whilst most bets the casino offers to players have a built in house edge, betting on the spread offers an opportunity for the astute gambler. When a casino accepts a spread bet, it gives the player the odds of 10 to 11, or -110. That means that for every 11 dollars the player wagers, the player will win 10, slightly lower than an even money bet. If team A is playing team B, the casino is not concerned with who wins the game; they are only concerned with taking an equal amount of money of both sides. For example, if one player takes team A and the other takes team B and each wager $110 to win $100, it doesn't matter what team wins; the casino makes money. They take $100 of the $110 from the losing bet and pay the winner, keeping the extra $10 for themselves. This is the house edge. The goal of the casino is to set a line that encourages an equal amount of action on both sides, thereby guaranteeing a profit. This also explains how money can be made by the astute gambler. If casinos set lines to encourage an equal amount of money on both sides, it sets them based on the public perception of the team, not necessarily th

In Gambling What Is A Teaser