Before revision:  In particular for }  S being the open sets we show that the absence of arbitrage opportunities, with respect to an opportune filtration enlargement, guarantees the existence of full support martingale measures.
After revision:  In particular for } absence of Model Independent Arbitrage is equivalent to the existence of a martingale measure; for S being the open sets we show that the absence of arbitrage opportunities, with respect to an opportune filtration enlargement, guarantees the existence of full support martingale measures.