Do Equity and Options Markets Align on Volatility Expectations?
New research tests market coherence using 0DTE options.
1What Are 0DTE Options?
0DTE (0 Days to Expiration) options are instruments that expire at the end of the same trading day, providing immediate exposure to market volatility. This study uses them to test the alignment between equity and options markets regarding small price movements. It examines the theoretical requirement for volatility expectations to converge in frictionless markets.
2The Concept of Pseudo-Arbitrage
Researchers propose that minor volatility discrepancies between markets could create 'pseudo-arbitrage' opportunities—potential risk-free profits from combined 0DTE and underlying asset positions over ultra-short horizons. However, while theoretically possible, practical barriers prevent exploitation of these opportunities.
3Empirical Findings
Data analysis reveals statistically significant volatility mismatches, but transaction costs and short-term risks make them practically unexploitable. Estimation risk and liquidity constraints particularly hinder pseudo-arbitrage strategies, supporting market efficiency despite observable discrepancies.
4Transaction Costs as Barriers
The study shows how even small volatility differences are quickly offset by trading costs (spreads, commissions). High-frequency execution turns theoretical arbitrage profits negligible, reinforcing the efficient market hypothesis. This finding has implications for algorithmic trading strategies.
5Short-Term Volatility Risk
0DTE strategies face inherent jump risk due to their ultra-short duration. Research demonstrates how unpredictable price movements severely distort reward/risk ratios for pseudo-arbitrage attempts, creating a deterrent for market participants despite apparent opportunities.
6Implications for Market Efficiency
Results support market efficiency by showing general alignment in short-term volatility expectations between cash and derivatives markets. The impracticality of exploiting rare discrepancies highlights the robustness of modern financial ecosystems, offering valuable insights for high-frequency traders and volatility strategists.
Original article: Journal of Finance — Opsiyon ve Hisse Piyasaları Volatilite Konusunda Uyumlu Mu?