The triumph of the good faith purchaser has been one of the most dramaticepisodes in our legal history. In his several guises, he serves a commercialfunction: he is protected not because of his praiseworthy character, but tothe end that commercial transactions may be engaged in without elaborateinvestigation of property rights and in reliance on the possession of propertyby one who offers it for sale or to secure a loan. As the doctrine strikes roots inone or another field, the good faith component tends to atrophy and thecommercial purchaser is protected with little more than lip service paid tohis bona fides