How Does the Time until Expiration (Time Decay) Influence the Options Bid-Ask Spread?
Options closer to expiration have higher time decay (Theta) and are generally more sensitive to small price changes in the underlying asset. This increased sensitivity and the rapidly changing risk profile cause market makers to widen the bid-ask spread for short-dated options to compensate for the higher risk of adverse price movement before they can hedge.
This wider spread directly increases the potential for slippage on those contracts.
Glossar
Time until Expiration
TimeHorizon ⎊ Time until Expiration, or Time to Maturity, is the remaining duration until an options contract reaches its conclusion and its intrinsic value must be determined or the right forfeited.
Adverse Price Movement
Exposure ⎊ Adverse price movement within cryptocurrency derivatives represents a deviation from anticipated directional forecasts, impacting portfolio valuations and risk parameters.