and the existence of an equivalent martingale measure is a folk theorem, see Harrison and Kreps (1979). We establish a … equivalent symmetric martingale measure sets, in a dynamic trading framework under absence of prior depending arbitrage. We prove … price systems ; arbitrage ; equivalent symmetric martingale measures set (EsMM set) ; symmetric martingales ; Girsanov for G …

traced back to certain developments in economic theory since the so-called "marginalist revolution", which enabled the …