easy · Quantitative Finance

The martingale property E^Q[e^-rT S_T | F_t] = e^-rt S_t implies that the best prediction of a future discounted price is:

  1. Zero, because all randomness is stripped away
  2. The current discounted price
  3. The real-world expected price at maturity
  4. The future spot price multiplied by volatility

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