What is hedging. The lock-in math, the EV rule, the retail traps.

Plain-English answer

Hedging is placing a bet on the opposite side of an outstanding ticket to lock in a guaranteed profit or cap a worst-case loss before the original ticket settles. The classic case is a futures bet that has appreciated. You bet a team to win the championship at +2000 in October for $100 (potential payout $2,100). They reach the final and the moneyline opens at -150. Hedging means betting the opponent at +130 for the size that flattens the outcome: stake the hedge so total payout is the same whether the original or the hedge wins. The math: hedge stake equals (original payout) divided by (1 plus hedge decimal odds). For our example, hedge stake = 2,100 / 2.30 = $913, locking $1,087 profit either way against the $100 original (a 1,087 percent locked return). The decision rule is not 'hedge always when up' but 'hedge when the implied probability of the original side is below the breakeven implied probability of the hedge price.' If the original is more likely to win than the hedge price implies, letting it ride has higher expected value than locking. Most retail hedges are emotional, not EV-driven.

Compare the implied probability of the hedge price to your model (or the no-vig fair price) for the original side winning.

• Original side > hedge implied: let it ride. The hedge sells your edge cheap.
• Original side < hedge implied: hedge. Lock the lottery ticket; the market disagrees with the implicit probability the original price priced in.
• Bankroll override: if the unhedged outcome variance threatens monthly bankroll constraints (more than 25 percent of bankroll at risk), hedge regardless of EV. This is the Quarter-Kelly safety floor we publish at /learn/kelly-criterion.

EV is the default lens; bankroll variance is the override. The mistake is hedging on emotion (locked profit feels good) without running either check.

Use it live

Pair the hedge read with the hedge calculator for stake sizing, expected value for the EV decision rule, and no-vig fair pricing to make sure the hedge is not eating two layers of book vig.