Abstract
Estimates are developed for the number of people incarcerated in the United States for drug law violations between 1972 and 2002, broken down by type of institution (federal prison, state prison, or jail) and, to the extent possible, by nature of drug offense (possession or use, trafficking, or other). These time series are compared to trends in drug use indicators, revealing at best weak correlations, and the absolute levels are compared to different market indicators to draw various inferences. For example, even though about 480,000 people are incarcerated for drug law violations, on average retail sellers spend less than 2 hours behind bars per sale. Still, full-time sellers might expect to spend 3 months incarcerated per year of selling, suggesting that there are roughly four active drug sellers for every one who is incarcerated.
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