It says in SA OC Siman 497 Sif 17 that one may sell to a gentile on Yom Tov a treif animal (i.e. after this animal was slaughtered on Yom Tov permissibly it was found to be treif, non-kosher). The SA says this may be sold to a gentile in the same way that one may "sell" to a Jew on Yom Tov, meaning to say without weighing things or mentioning the price. The SA ends off, however, that if you do not trust the gentile then you may take a mashkon (collateral), seemingly in order to assure that the gentile comes to back back after Yom Tov. Is this same true by a Jew? If one is selling things to a Jew on Yom Tov in a way that is permitted (i.e. without weighing or mentioning a price) but is concerned that this particular Jew might not pay him after Yom Tov, may a mashkon be taken?
In Shulchan Aruch Horav 307,20 he says that if he does not trust the other Yid (Jew), the other Yid leaves a Mashkon without explicitly saying that it is a Mashkon.