The term 'BOOKMAKER's Concern' can be summarized as the ODDS of a particular event. Bookmakers are people who take bets on the outcome of a certain event, such as a horse race or a football match. They use the ODDS to determine how much money they will make from the bet. The ODDS are calculated based on the probability of the event occurring and the amount of money wagered. The higher the ODDS, the more money the BOOKMAKER stands to make.