Table 10 shows the number of resp<strong>on</strong>dents who, according to the NHSDA, used these other drugs between<strong>1988</strong> and 1999. To complete the table, estimates for <strong>2000</strong> were set to the 1999 estimate. Those resp<strong>on</strong>dentswho admitted use during the year were asked how frequently they used the drug. 51 We then used these datato compute an average number of days a year that the resp<strong>on</strong>dents used a drug. 52 Since the survey lacksinformati<strong>on</strong> about the number of doses taken <strong>on</strong> days that the drug was used, we assumed that each day of useresulted in a single dose. This is most certainly an underestimate.It is difficult to determine prices per dose. Both the Drug Enforcement Administrati<strong>on</strong>’s (DEA) <strong>Illegal</strong> DrugPrice/Purity Report and the Nati<strong>on</strong>al Institute <strong>on</strong> Drug Abuse's Community Epidemiology Working Group(CEWG) provided wide ranges. 53 For current purposes, we assumed that each dose costs $5, a price that wasc<strong>on</strong>sistent with those reported by the DEA and the CEWG. These street prices may be too high, however,because many of the legal drugs were likely to have been purchased at prescripti<strong>on</strong> prices and diverted toillegal use.To estimate the yearly expenditures <strong>on</strong> these drugs, we multiplied three factors: the number of users, by theaverage number of doses per year, by the price per dose. Our best estimate is that Americans spent between$2 billi<strong>on</strong> and $3 billi<strong>on</strong> <strong>on</strong> other drugs each year during the last decade (Table 10).These estimates are imprecise for the reas<strong>on</strong>s noted above. However, even if we halve or double the estimatesto reflect uncertainty, drugs other than cocaine, heroin, marijuana and methamphetamine must be a relativelysmall part of the total expenditure that Americans make <strong>on</strong> illicit substances and <strong>on</strong> legal substances c<strong>on</strong>sumedillegally.C<strong>on</strong>clusi<strong>on</strong> about C<strong>on</strong>sumpti<strong>on</strong>According to estimates based <strong>on</strong> the prevalence-based procedure, Americans spent about $67 billi<strong>on</strong> <strong>on</strong> heroin,cocaine, methamphetamine, marijuana, and other illegal drugs in 1999: $36 billi<strong>on</strong> <strong>on</strong> cocaine, $10 billi<strong>on</strong><strong>on</strong> heroin, $11 billi<strong>on</strong> <strong>on</strong> marijuana, $6 billi<strong>on</strong> <strong>on</strong> methamphetamine, and $2.6 billi<strong>on</strong> <strong>on</strong> other illegal drugs(Table 11). Table 11 appears to show a substantial decrease in expenditures <strong>on</strong> illicit drugs between 1990 and<strong>2000</strong>. Most of this change is attributable to inflati<strong>on</strong> as reflected in the c<strong>on</strong>sumer price index. This decreasemay not be apparent to chr<strong>on</strong>ic users, because illicit drug c<strong>on</strong>sumpti<strong>on</strong> is a predominant part of their marketbasket (illicit drugs are not part of the market basket used to compute the CPI), while the nominal price of28
heroin and cocaine have fallen or remained about the same since <strong>1988</strong>, and the price of marijuana has fallensince 1992. On the other hand, these decreased expenditures may have very real c<strong>on</strong>sequences for dealers,who probably have market baskets that are much more like that of typical American c<strong>on</strong>sumers.29