Lesson 13: Your fair-value estimate is itself a guess. The buffer is what protects you when the guess is wrong.Your estimate might be wrong. So?You think it's worth $100 a share.If you decide to buy, what's the sensible move?APay right up to $100That's exactly what your estimate says.BPay well below $100, leaving room to be wrong.CWait until the price climbs above $100 to confirm you were right.