About the HPT Resource Index
The Hypothetical Purchase Task (HPT) is a behavioral-economic method for measuring demand — how much of a commodity people say they would consume across a range of prices. This index catalogs published and preprint HPT studies so researchers can browse and filter by commodity, category, and study design, and see each study's sample, price schedule, and country at a glance.
Methodology & scope
This is a curated, living index rather than a formal systematic or scoping review. Treat this as ongoing curation, not a claim of exhaustive literature coverage.
What counts as an HPT study. We include studies using the Hypothetical Purchase Task (HPT) methodology specifically — not delay, probability, effort, or social discounting studies, which use a related but distinct framework. HPT studies are usually price-based, but we also include hypothetical budget-allocation studies that substitute a different constraint for price (e.g., likelihood of success rather than a dollar amount), when the underlying demand-curve logic is the same.
How studies are identified. The index began from Jacobs & Bickel's (1999) original HPT paper — the study that introduced the methodology. This is not an exhaustive multi-database systematic search, so coverage will grow over time rather than being complete from the start.
About PROMISE Labs Africa
The HPT Resource Index is a project of PROMISE Labs Africa, a 501(c)(3) scientific nonprofit dedicated to cutting-edge translational behavioral research in Africa — rapidly testing innovative interventions in simulated environments to understand, predict, and influence real-world behaviors.
Acknowledgments
Thank you to our research assistants, Deborah Odaudu and Osajimere Atalor, for their work compiling and coding the studies in this index.