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Betting on sporting events is big business both in the US and abroad. Consider, for instance, next winter’s American football tournament known as the Superbowl. Billions of dollars will be bet. The vast majority of bets are placed on individual teams, though more complex bets are available. The attached table shows the odds posted on July 15, 2017, by one of the largest on-line betting shops in Great Britain. (Online gambling is illegal in California.) Odds are offered on the 32 potential participants in the tournament. The table is interpreted as follows: the Los Angeles Chargers, for example, have odds of 40. If you bet on the Chargers, the betting shop pays you 40 times your bet and you get your bet back if the Chargers win the Superbowl, and you lose your bet if the Chargers do not win. We say the odds in favor of the LA Chargers winning are 1 to 40. The odds posted are for a team winning: you may not bet on a team losing using its posted odds (though, you could theoretically create a bet on a team losing by using bets for the other teams). There are no ties.
If a bet on the Los Angeles Chargers at these odds were a fair bet, then on average you would neither win nor lose by making this bet. Suppose that you bet £1 on the Chargers. Let p denote the probability of winning implied by a fair bet; hence, (1-p) is the probability of losing. Then, £40p is the anticipated amount to be won, £1(1-p) is the anticipated amount to be lost, and, if the bet is fair,
40p = 1(1-p).
Solving for p yields p = 1/41. More generally, a fair bet with odds of 1 to b implies that the fair bet probability p of winning is p=1/(b+1).
1. Using the odds given in the table, compute the probability implied by a fair bet for each team. Do these numbers you have computed satisfy the rules for probability?
An arbitrage opportunity exists if there is a sequence of gambles at the posted odds that never loses money and wins a positive amount with positive probability. Betting houses try to arrange the bets they accept in order to create and exploit an arbitrage opportunity.
2. Consider several schemes the betting house could use:
(a) accept exactly 32 bets, each of size £1 on each of the thirty two listed teams;
(b) accept exactly 32 bets -- £32 on New England, £31 on Green Bay, … £1 on New York Jets.
Does either of these schemes represent an arbitrage opportunity for the betting house? If not, does an arbitrage opportunity exist, and what might one look like?
(Hint: Consider a scheme that accepts exactly 32 bets, with the amount accepted on each team proportional to the implied fair-bet probability you computed above.)
1 Based on Patrick Larkey, “Fair Bets on Winners in Professional Golf,” Chance, V. 3, N. 4, 1990, 24-26. This case was written by Professor Steven Lippman, UCLA.
Odds Posted on www.paddypower.com on July 15, 2017
New England Patriots
4/1
Arizona Cardinals
25/1
Los Angeles Chargers
40/1
Green Bay Packers
10/1
Minnesota Vikings
25/1
Detroit Lions
40/1
Seattle Seahawks
10/1
Baltimore Ravens
30/1
Washington Redskins
50/1
Pittsburgh Steelers
11/1
Indianapolis Colts
30/1
Jacksonville Jaguars
60/1
Dallas Cowboys
12/1
Houston Texans
30/1
Buffalo Bills
66/1
Atlanta Falcons
12/1
Cincinnati Bengals
33/1
San Francisco 49ers
100/1
Oakland Raiders
18/1
Tampa Bay Buccaneers
33/1
Chicago Bears
100/1
Denver Broncos
20/1
Philadelphia Eagles
40/1
Cleveland Browns
200/1
Kansas City Chiefs
20/1
New Orleans Saints
40/1
Los Angeles Rams
200/1
New York Giants
20/1
Tennessee Titans
40/1
New York Jets
200/1
Carolina Panthers
22/1
Miami Dolphins
40/1

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