Economic modelling of the gateway effect

Area of Science:

• Economics
• Addiction Studies
• Behavioral Economics

Background:

• Empirical research shows patterns in drug use sequencing.
• Economic models traditionally focus on single-substance addiction, neglecting complex drug use behaviors.

Purpose of the Study:

• To present a general economic model of substance use incorporating multi-commodity habit formation.
• To analyze the intertemporal relationship between legal and illicit drug consumption.
• To explain the gateway effect in drug use.

Main Methods:

• Development of a general model of substance use.
• Analysis of a simple two-drug model to examine multi-commodity habit formation.
• Examination of the conditions for the existence of multi-commodity habit formation.

Main Results:

• Multi-commodity habit formation increases the marginal utility of initiating a new drug after prior consumption.
• Individuals initiate drug use with the substance possessing the lowest marginal cost.
• Differences in marginal costs between legal and illegal drugs explain observed drug use sequencing.

Conclusions:

• The developed model provides a theoretical framework for understanding complex drug use patterns.
• Economic factors, specifically marginal costs, play a crucial role in determining the sequence of drug initiation.
• The model offers insights into the gateway effect and multi-substance addiction.