意外事件代表初始条件或参数变化，新场新估价，否则就还是旧场，或新场变旧，因此定价有回归场中心的倾向

意外事件代表初始条件或参数变化，新场新估价，否则就还是旧场，或新场变旧，因此定价有回归场中心的倾向


新场变旧 is fast, or "premium" decay as times goes on, regress to mean, mkt overprice "premium" but in a short time very often, at least with a counter rally even very bad news hit;

double dip, bond bubble are becoming old? unless with some other shocks,