The phrase originates from the practice of recording such wagers in a hard-bound ledger (the 'book') and gives the English language the term bookmaker for the person laying the bets and thus 'making the book'. In gambling parlance, making a book is the practice of laying bets on the various possible outcomes of a single event. Please help improve this article by introducing citations to additional sources.įind sources: 'Mathematics of bookmaking' – news Relevant discussion may be found on the talk page.
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