A person or organization expressing an interest in acquiring the offered item of value is referred to as a potential buyer, prospective customer, or prospect. Buying and selling are understood to be two sides of the same "coin" or transaction. Both seller and buyer engage in a process of negotiation to consummate the exchange of values. The exchange, or selling, process has implied rules and identifiable stages. It is implied that the selling process will proceed fairly and ethically so that the parties end up nearly equally rewarded. The stages of selling, and buying, involve getting acquainted, assessing each party's need for the other's item of value, and determining if the values to be exchanged are equivalent or nearly so, or, in buyer's terms, "worth the price". Sometimes, sellers have to use their own experiences when selling products with appropriate discounts.

Selling is the profession-wide term, much like marketing defines a profession. Recently, attempts have been made to clearly understand who is in the sales profession, and who is not. There are many articles looking at marketing, advertising, promotions, and even public relations as ways to create a unique transaction.

Many believe that the focus of selling is on the human agents involved in the exchange between buyer and seller. Effective selling also requires a systems approach, at minimum involving roles that sell, enable selling, and develop sales capabilities. Selling also involves salespeople who possess a specific set of sales skills and the knowledge required to facilitate the exchange of value between buyers and sellers that is unique from marketing and advertising.

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