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- Historical Prices
Historical Prices
Observations from historical variance swap prices:
- They tend to follow high and low regimes in a similar manner to realised variance.
- Longer maturity VS levels vary less and react less to spikes.
A sudden unexpected event:
- likely to dramatically increase ST volatility dramatically
- less likely to cause the same level of elevated volatility over the next few years
- Single-stock variance swaps generally trade at higher levels than index variance.
- diversification effect
- single stock variance can increase substantially in times of high company uncertainty
- Variance swap levels are well correlated with realised volatility
VIX gives a proxy for rolling 1-month maturity variance swap levels on SPX. VS levels follow the underlying pattern of volatility regimes.
- Variance swaps tend to trade somewhat above levels of realised volatility
2 distinct reasons:
- variance swaps are convex in volatility --> VS buyer should fairly pay for convexity --> VS > ATM IV
- volatility risk premium: investor risk aversion and hedging programmes --> ATM IV > RV
Simple framework: VS > ATM IV > RV
- Vanilla option IVs trading above prevailing RV due to the volatility risk premium (~2-3 vegas)
- VS levels trading above ATM IVs due to the convexity premium (~ 1-2 vegas)