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Related Experiment Video

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Using a Virtual Store As a Research Tool to Investigate Consumer In-store Behavior
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Are users' most recent drug purchases representative?

Brittany Bond1, Jonathan P Caulkins2, Nick Scott3

  • 1U.S. Department of Commerce, Office of the Chief Economist, Washington, DC, United States.

Drug and Alcohol Dependence
|July 11, 2014
PubMed
Summary
This summary is machine-generated.

Surveys asking about the most recent illicit drug purchase accurately reflect general purchasing patterns. This method is economical for estimating drug market size without significant bias in spending or deal characteristics.

Keywords:
CannabisDrug marketsDrug purchasesInjection drug useMarijuanaSurvey methods

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Area of Science:

  • Drug use epidemiology
  • Illicit drug market analysis
  • Survey methodology

Background:

  • Estimating illicit drug market size often relies on surveys asking about recent purchases.
  • Potential bias exists if the timing of survey administration affects the sample of most recent purchases compared to all purchases.

Purpose of the Study:

  • To investigate whether focusing on the most recent illicit drug purchase introduces bias compared to a random sample of all purchases.
  • To assess the validity of using the 'most recent purchase' data for market size estimation.

Main Methods:

  • Analysis of data from 688 respondents in the Melbourne Injecting Drug User Cohort Study (2008-2013).
  • Analysis of data from 2782 respondents to the Washington Cannabis Consumption Study (2013).
  • Comparison of responses about the most recent purchases with data on multiple recent purchases.

Main Results:

  • No significant differences were found in spending amounts for heroin, methamphetamine, and cannabis between the most recent purchase and average spending on multiple purchases.
  • No differences were observed in the locations and types of illicit drug deals.
  • The time intervals between consecutive cannabis purchases remained consistent across the first, second, and third most recent transactions.

Conclusions:

  • Asking about the most recent illicit drug purchase is an economical and valid method for understanding general purchasing behavior.
  • The study found minimal evidence of substantial variation between the most recent purchase and other recent purchases across two distinct populations.
  • Further research is recommended to replicate these findings in diverse user populations to confirm generalizability.