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Explain a protective put: the objective it serves, how it is constructed, its expiry payoff and value, its profit and risks, the most it can gain or lose, and the underlying price at which it breaks even

CFA® Level III · Derivatives and Risk Management · Options Strategies · L3.DR.1.c

The idea

A protective put is a long asset plus a long put, bought as insurance: the holder keeps the upside but sets a floor under value. Value at expiry is S + max(0, X − S); profit subtracts S0 and the premium p. Maximum loss is S0 − X + p, the deductible plus the premium. Maximum profit is unlimited; breakeven is S0 + p. With S0 = 50, X = 45 and p = 1.50, the worst loss is 6.50 and breakeven is 51.50. The key judgement is the strike: a lower one is cheaper but leaves a bigger deductible. The real risk is cost: repeated premiums drag on return.

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