I personally believe we are all selling all the time, and some people are aware of this and take speaking as an art. “All the world's a stage,
and all the men and women merely players: They have their exits and their entrances; and one man in his time plays many parts”, Shakespeare, from “As You Like It”

Mrs. Thatcher’s political associates made it perfectly clear to her that her voice was too high pitched, and had a bit of a warble and that her voice would make it difficult for her to win over all the male candidates in her first major election. She was the only woman running and was surrounded by male candidates who would hear her as lacking credibility and authority and use it against her.  Also the voters would be affected by the quality of Mrs. Thatcher’s voice.

Consciously using your voice to sell your ideas, products and services will give you a competitive edge in the market place. Why? Because most sales people have no awareness of how they sound and that the sound of their voice is holding them back.

Many sales people, especially telephone salespeople, speak to fast, because they are working the numbers strategy which is if they speak to X number of customers per hour they are bound to close some of them. Of course this requires speaking fast and making a snap judgment as to whether the customer has the money and/or the interest in buying.