Usually B has several friends, A1...An, that all ask B to use $APP1...$APPk, where k >> 1. There is an incentive to converge to $APP, the tradeoffs are not col

Usually B has several friends, A1...An, that all ask B to use $APP1...$APPk, where k >> 1. There is an incentive to converge to $APP, the tradeoffs are not collectively symmetric when one $APP is already globally dominant.