medium · FRM Part 1 Financial Markets and Products

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 always higher than for European ones.
  2. The American put is always affected by dividends more than the European put option is.
  3. The American put can be exercised immediately to receive the full intrinsic value.
  4. European puts are used only for hedging purposes, which reduces their overall market value.

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