## Not All Markets Have the Same EV Profile
A 2% EV edge on a 1X2 market behaves very differently from a 2% EV edge on an accumulator or a player prop. Understanding these differences prevents you from mixing up EV metrics across incomparable markets.
## Single Bets: The Clean Baseline
Singles have the most interpretable EV. Your probability estimate, the offered price, and the EV formula give a single, clear number.
**Benchmark all other market EV against singles.** If you cannot calculate cleaner EV on a market type, you probably should not be betting it.
## Accumulator EV: Compounding Uncertainty
For a 3-leg accumulator where each leg has +2% EV:
Combined EV ≈ 1.02 × 1.02 × 1.02 − 1 = 6.1% on the parlay odds
This seems to compound the edge — but it also compounds the uncertainty in your probability estimates. A 2% EV edge based on a correctly calibrated model is very different from a 2% EV edge based on a rough guess.
**Rule:** Only combine legs in accumulators if each individual leg EV is well-validated. An accumulator of five dubious 2% EV selections is not better than one solid 2% EV single — it is riskier without proportionately more edge.
## Prop Bet EV: The Data Problem
Player prop markets (first scorer, assists, passing yards) often have higher nominal EV — markets are less efficient. But your probability estimates for props require player-level data that is harder to validate for calibration.
**Rule:** Higher apparent EV in less-liquid markets may reflect worse estimation, not genuine edge. Validate props against closing lines before scaling stakes.
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