Pari-Mutuel (Pooled) Betting

A betting system where all stakes go into a shared pool, the operator removes a takeout, and the remainder is divided among winners, so odds are set by the pool rather than fixed in advance.

Definition

In Pari-Mutuel (Pooled) Betting, everyone backing a market pays into a common pool; the operator deducts a fixed percentage, the 'takeout', for costs, taxes and profit, and the rest is shared among the winning tickets, so the payout per winner depends on how much was staked and how many others won. Because odds are determined only when betting closes, bettors do not know their exact return when they stake, unlike fixed-odds betting. The model underpins the tote in horse and greyhound racing, many lotteries and keno, and jai alai, with takeouts commonly in the mid-teens to over 30 percent depending on the pool and jurisdiction. The takeout guarantees the operator a margin regardless of the result, making pooled betting negative expected value for participants as a group.

Worked example

A win pool holds 10,000 units; the operator takes 18 percent (1,800), leaving 8,200 to be shared among the winning tickets, so backers of the winner split that amount in proportion to their stakes.

Why it matters

Pari-mutuel is the pooled alternative to fixed odds and the backbone of tote and lottery payouts; learners see how takeout works, professionals see pool liquidity and dividend calculation.

Related

Note: Takeout percentages vary widely by pool type, sport and jurisdiction; the mid-teens to 30 percent-plus range is indicative rather than a fixed rate for any specific pool.