The current study extended previous findings that the multiplier potential of a slot machine is related to gambling losses (Sharpe, Walker, Coughlan, Enerson & Blaszczynski, 2005). The multiplier potential of a slot machine was defined as comprising three components; the monetary denomination, the maximum number of pay-lines and the maximum bet multiplication. The relationship between these three components of the multiplier potential and a slot machine’s average bet size was examined in a sample of 323 Australian machines. All machines were operating in gaming venues and expenditure measures were obtained from data recorded by the machines. Results indicated that machine denomination (e.g., 1-cent, 2-cents) and the maximum number of pay-lines were significant predictors of average bet size but no significant relationship was found between the bet multiplication variable and bet size. These results are discussed with regard to established contingencies and reinforcement rates.



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