One of the problems of the early game was to find a way to draw a random number. Initially, winning numbers were set by the daily outcome of a random drawing of numbered balls, or by spinning a "policy wheel", at the headquarters of the local numbers ring. The daily outcomes were publicized by being posted after the draw at the headquarters, and were often "fixed". The existence of rigged games, used to cheat players and drive competitors out of business, as well as the practical obstacles to holding a drawing for a lottery that is illegal, later led to the use of widely published unpredictable numbers such as the last three numbers in the published daily balance of the United States Treasury, or the middle three digits of the number of shares traded that day on the New York Stock Exchange.