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Reliability of an adaptive marijuana purchase task.

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The marijuana purchase task (MPT) shows reliability for measuring cannabis demand across repeated use. An adaptive MPT, accounting for product and division preferences, also proved reliable, highlighting its importance for accurate cannabis research.

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Area of Science:

  • Behavioral Economics
  • Psychopharmacology
  • Substance Use Research

Background:

  • Purchase tasks assess substance demand, but cannabis use varies in form and measurement.
  • Previous marijuana purchase tasks (MPT) may not capture diverse cannabis consumption patterns.
  • Assessing the temporal stability of MPTs across different cannabis products and units is crucial.

Purpose of the Study:

  • To evaluate the temporal stability of an original and an adaptive MPT for cannabis.
  • To determine if an adaptive MPT, allowing user-selected product and division, improves measurement reliability.
  • To investigate the impact of user preference consistency on MPT reliability.

Main Methods:

  • Recruited 50 monthly cannabis users via Amazon Mechanical Turk for baseline and repeat MPT assessments.
  • Administered both original and adaptive MPTs, with the adaptive version allowing selection of preferred cannabis product and division (e.g., grams, hits).
  • Analyzed temporal stability using correlations between baseline and repeated measures, and permutation testing for differences between MPT versions.

Main Results:

  • Both original and adaptive MPTs demonstrated significant temporal stability across repeated measurements.
  • The adaptive MPT showed significant correlations for maximum price (Pmax) and maximum quantity demanded (Qmax).
  • Significant differences were found between original and adaptive MPTs for breakpoint and elasticity, especially when users switched preferences.

Conclusions:

  • Both the original and adaptive MPT are reliable measures for assessing cannabis demand over time.
  • Incorporating user-specific cannabis product and division preferences in an adaptive MPT enhances measurement validity.
  • Future research should consider individual consumption patterns when utilizing purchase tasks for cannabis.