Bargaining is thus a way of determining an appropriate price, not simply a way for the shopkeeper to get more money from the buyer.
Bargaining is a tool that shopkeepers always use to try to get buyers to pay more for the items being sold. 
mnli hypothesis: Bargaining is a tool that shopkeepers always use to try to get buyers to pay more for the items being sold.  premise: Bargaining is thus a way of determining an appropriate price, not simply a way for the shopkeeper to get more money from the buyer.