Economics as a factor in models of behavioral motivation and change

This note first presents a summary of four main behavioral models that are used to explain behavioral motivation and change. Three models are based on psychosocial theory. They are: 1) the Theory of Reasoned Action, 2) the Th eory of Planned Behavior, and 3) the Theory of Stages-of-Change. The fourth model is based on economic theory and is known as the Rational Addiction M odel. Each model is analyzed for its strengths and weaknesses. The note con cludes by arguing for the usefulness of integrating the economic and the ps ychosocial models to study drug use. Specific examples and suggestions are presented.