The Greatest Salesman in the World is a book, written by Og Mandino, that serves as a guide to a philosophy of salesmanship and success through the story of Hafid, a poor camel boy who achieves a life of abundance.

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Although the book is only 111 pages and could be read over a weekend, if you follow the author's suggested reading structure, the book will take you 10 months to read.

Mandino composed The Legend of the Ten Scrolls which he advises to read each scroll, three times a day for 30 days each. 

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Matthew McConaughey cites this as the book that changed his life.

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This book will change your life. It changed mine. If sales had a bible, this would be it.