A sale is the act of selling a product or service in return for money or other compensation. It is an act of completion of a commercial activity.

The seller' or salesperson – the provider of the goods or services – completes a sale in response to an acquisition or to an appropriation^{[disambiguation needed ][citation needed]} or to a request. There follows the passing of title (property or ownership) in the item, and the application and due settlement of a price, the obligation for which arises due to the seller's requirement to pass ownership. Ideally, a seller agrees upon a price at which he willingly parts with ownership of or any claim upon the item. The purchaser, though a party to the sale, does not execute the sale, only the seller does that. To be precise the sale completes prior to the payment and gives rise to the obligation of payment. If the seller completes the first two above stages (consent and passing ownership) of the sale prior to settlement of the price, the sale remains valid and gives rise to an obligation to pay.

Brian Tracy (born January 5, 1944 in Charlottetown, PEI, Canada) is a self-help author and motivational speaker. He serves as Chairman of Brian Tracy International, a human resource company based in Solana Beach, California, with affiliates throughout the United States and thirty-one other countries.

After dropping out of high school before graduation, Tracy got a job on a tramp steamer and traveled around the world for eight years, eventually visiting more than eighty countries on five continents.

When he could no longer find a job as a laborer, he went into sales. Struggling at first, he decided to ask other successful salesmen for advice, and then to emulate them. By the end of his first year, he attained the status of top salesman. After his second year, he was made a Vice President in charge of 95 people. At the time he was only 25 years old.

Beginning in 1981, Tracy assembled his "success system", which was initially called "The Phoenix Seminar." Three years later, in 1985, he released an updated version of this seminar as a self-help audio tape entitled "The Psychology of Achievement".

Grant Cardone (born March 21, 1958) is an American entrepreneur, motivational speaker, author, and host of the National Geographic television show, Turnaround King.

Cardone was born on March 21, 1958, in Lake Charles, Louisiana. His father was Curtis Louis Cardone (died February 1968) and his mother was Concetta Neil Cardone (died May 2009). He is the fourth of five children.

Cardone graduated from La Grange High School in Lake Charles in 1976. He then went to McNeese State University from 1976-1981 where he graduated with a Bachelor of Science Degree in Accounting. Cardone was awarded the McNeese State University Distinguished Alumnus Award 2010.

In 1987, Cardone moved from Lake Charles to Chicago to work for a sales-training company. Although he lived in Chicago, he traveled all over the United States, living in different cities. Grant briefly returned to Lake Charles before moving to Houston, Texas, where he lived for the next five years. He then spent the next 12 years in La Jolla, California, before finally moving to Los Angeles, where he has resided since 2003. His home was featured on How’d You Get So Rich?, where Joan Rivers toured the home and talked to Cardone about his success story.

Hilary Hinton "Zig" Ziglar (born 6 November 1926) is an American author, salesman, and motivational speaker.

Zig Ziglar was born in Coffee County, Alabama, to parents John Silas Ziglar and Viola Ziglar. He was the tenth of 12 children.

In 1931, when Ziglar was five years old, his father took a management position at a Mississippi farm, and his family moved to Yazoo City, Mississippi, where he spent most of his early childhood. In 1932, his father died of a stroke, and his younger sister died two days later.

Ziglar served in the Navy during World War II (circa 1943 to 1945). He was in the Navy V-12 Navy College Training Program, attending the University of South Carolina.

In 1944 he met his wife, Jean, in Jackson, Mississippi; he was 17 and she was 16. They married in late 1946.^{[citation needed]}

Ziglar later worked as a salesman in a succession of companies. In 1968 he became a vice president and training director for the Automotive Performance company, moving to Dallas, Texas.

In 1970, Ziglar went into the business of motivational speaking full-time, with an emphasis on Christian values. Until then, he had called himself by his given name, Hilary, but now started using his nickname, Zig, instead.^{[citation needed]}