I don’t know whether it’s equivalent but it seems the transaction is equivalent to a $20-$30 price point fair deal plus a $80-$70 sized gift. In the limit if a dollar is worth equal to everyone then a gift $X-$X=0 no net change from gifting. The trade part comes from evaluation being higher than cost. This would be true even if the beneficiary and the cost bearer would be the same party.
I don’t know whether it’s equivalent but it seems the transaction is equivalent to a $20-$30 price point fair deal plus a $80-$70 sized gift. In the limit if a dollar is worth equal to everyone then a gift $X-$X=0 no net change from gifting. The trade part comes from evaluation being higher than cost. This would be true even if the beneficiary and the cost bearer would be the same party.