hard · Quantitative Finance

In the Heston model, the variance process v_t is not a traded asset.

How does this affect the Girsanov change of measure to the risk-neutral measure Q?

  1. An additional market price of risk for the variance must be assumed or calibrated, as it is not uniquely determined by the stock price.
  2. The market price of risk for variance is automatically zero in any arbitrage-free model.
  3. The variance process becomes deterministic under the Q measure.
  4. The variance drift remains the same because only traded assets have their drifts shifted by Girsanov's theorem.

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