People have placed bets since time immemorial. However, in the 18th century, betting became widespread and popular amongst rich young men in London, who would place a bet on almost anything. Since many bets were placed by young, impetuous men who had had a few drinks, arguments often arose as to what exactly had been wagered. Therefore the clubs where they met took to having an official Club Book in which they could record their bets. When professionals came into the field, they wanted a name that associated them with this up-market wagering, so instead of saying that they were accepting bets, they said that they were "making a book" on an event. Hence bookmaker/
