Stahl, Philip; Blauth, Jérôme - In: Review of Derivatives Research 27 (2024) 1, pp. 85-111
The martingale theory of bubbles enables testing for asset price bubbles by analyzing option prices. As recently shown … by Piiroinen et al. (Asset price bubbles: an option-based indicator, 2018), the SABR model is a strict local martingale … theoretical result and analyze stock price bubbles in 2576 stocks over 26 years. Martingale defect conditions are absorbed quickly …