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. Author manuscript; available in PMC: 2017 Aug 4.
Published in final edited form as: Drug Alcohol Depend. 2014 May 13;141:27–33. doi: 10.1016/j.drugalcdep.2014.04.028

Fig. 1.

Fig. 1

Hypothetical changes in daily cocaine purchasing (U.S. dollars) as a function of the likelihood of arrest (0.25–8 times normal risk) when buying cocaine. As shown in this demand curve, the highest-income quartile (Q4) reported they would purchase significantly more cocaine than the low-income quartile (Q1) at most arrest probabilities (asterisks). Overall, there was a main effect of income quartile on expected cocaine purchasing (i.e., a shift in demand intensity), however, cocaine purchasing did not differentially decrease across groups as arrest probability increased (i.e., no group differences in price-elasticity).