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Bookmakers do not generally attempt to make money from the bets themselves but rather by acting as market makers and profiting from the event regardless of the outcome. Their working methods are similar to those of an actuary , who does a similar balancing of financial outcomes of events for the assurance and insurance industries.
The amount by which the actual 'book' exceeds 100% is known as the 'overround', [1]: 96–104 [2]: 126–130 'bookmaker margin' [4] or the 'vigorish' or 'vig' [4] and represents the bookmaker's expected profit. Thus, in an "ideal" situation, if the bookmaker accepts £120 in bets at his own quoted odds in the correct proportion, he will pay out ...
For example: If the bookmakers return percentage is 90%, 90% of the amount placed on the winning result will be given back to bettors and 10% goes to the bookmaker. Naturally the more money bet on a certain result, the smaller the odds on that outcome become. This is similar to parimutuel wagering in horse racing and dog racing. Half bets. A ...
Most exchanges make their money by charging a commission which is calculated as a percentage of net winnings for each customer on each event, or market. Gamblers whose betting activities have been restricted by bookmakers (normally for winning too much money) are able to place bets of unrestricted size as long as one or more opposing customers are willing to match their bets.
Vigorish (also known as juice, under-juice, the cut, the take, the margin, the house edge or the vig) is the fee charged by a bookmaker for accepting a gambler's wager. In American English, it can also refer to the interest owed a loanshark in consideration for credit.
It is ideal for bookmakers to price/mark up a book such that the net outcome will always be in their favour: the sum of the probabilities quoted for all possible outcomes will be in excess of 100%. The excess over 100% (or overround) represents profit to the bookmaker in the event of a balanced/even book. In the more usual case of an imbalanced ...
An odds compiler (or trader) is a person employed by a bookmaker or betting exchange who sets the odds for events (such as sporting outcomes) for customers to place bets on. . Apart from pricing markets, they also engage in any activity regarding the trading aspects of gambling, such as monitoring customer accounts and the profitability of their operati
Arbitrage betting involves relatively large sums of money, given that 98% of arbitrage opportunities return less than 1.2%. [2] The practice is usually detected quickly by bookmakers, who typically hold an unfavorable view of it, [3] and in the past this could result in half of an arbitrage bet being canceled, or even the closure of the bettor's account.