medium · Quantitative Finance

A proprietary trader uses a GARCH(1,1) model to forecast volatility for his Monte Carlo engine.

If the GARCH persistence α + β is very close to 1, what is the implication for the simulation?

  1. Volatility shocks will decay very slowly over the simulated paths
  2. The long-run variance σ^2_LR will be zero
  3. Antithetic variates will become invalid for GARCH-based simulations
  4. The simulation will converge faster because of the stability of the GARCH process

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