> I've always seen rent defined as payment collected in excess of the seller's cost to make and hand over the product What you described is nearly precisely th

> I've always seen rent defined as payment collected in excess of the seller's cost to make and hand over the product What you described is nearly precisely the definition of market power. Economic rent is, from what I've read (IANAE), a special case of market power that applies to factors of production (particularly land).