Margin (Overround)
Margin is the amount by which the implied probabilities of all outcomes in a market exceed 100%. A two-way market priced at 1.91/1.91 carries roughly a…
Margin is the amount by which the implied probabilities of all outcomes in a market exceed 100%. A two-way market priced at 1.91/1.91 carries roughly a 4.7% margin. Lower margins attract sharper bettors; higher margins increase theoretical hold but reduce competitiveness.
Realised hold sits below theoretical margin because of promotions, uneven liability and sharp money on mispriced markets.
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