easy · Quantitative Finance

Why does the presence of 'Fat Tails' in return distributions lead to a volatility smile?

  1. The BSM model assumes returns are lognormally distributed with no variance
  2. Fat tails increase the time decay (Theta) of the option
  3. The BSM normal distribution understates the probability of extreme moves
  4. Fat tails imply that the asset price cannot go to zero

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