But remember that in those "anonymous cash transaction" that occur in shops, the person with the goods can see the cash and the person with the cash can see the

But remember that in those "anonymous cash transaction" that occur in shops, the person with the goods can see the cash and the person with the cash can see the goods before the transaction takes place. Further, for most shops, at least, there's the presumption that the shop will still be there when a dissatisfied buyer returns with a problem.