Selling links or comes with older tradition trade. Customers are the reason for trade. Customer understanding on sales is less. Simply we are saying selling/trader is cheating on products/services regarding price. This article explains only in terms of price. Selling lies on price, reason for price, and also depends on product variation.
Customer has the right to choose trader or supplier. Needs to know why the rate is high and the reason behind this. Retailer may bring from wholesaler, wholesaler got from distributor. It is selling cycle. Each one has the margin and profit to gain. Price depends on urban or rural location, shop type, product demand, manufacturing cost, selling aspect.
Before in trade, products exchanged for commodities. Today services are charged. Sometimes company are not concern about customer requirement they just pushing the product. Understanding the model is important for a consumer to choose or buy a product and gather the brand royalty.