medium · FRM Part 1

For an American put option, the lower bound is defined as P ≥ max(K - S_0, 0).

Why is this bound higher than the lower bound for a European put (p ≥ max(Ke^-rT - S_0, 0))?

  1. The risk-free rate for American options is higher than for European options.
  2. The American put is always affected by dividends more than the European put.
  3. The American put can be exercised immediately to receive the full intrinsic value.
  4. European puts are only used for hedging, which reduces their market value.

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