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 see, at a glance, what has been studied, how, and with which demand models.

What's coded per study

• Study identification — year, journal, DOI, URL, publication status, open-access status
• Commodity — the good or behavior under study and its domain (e.g., substance, food, behavioral)
• Study design — design type, participant assignment, whether individual and/or aggregate demand curves were analyzed
• Participants — country, region, sample size, population, mean age
• Price schedule — number of prices tested, price range, currency
• Demand model — which model was fit (e.g., exponential, exponentiated, linear) and the k value used
• Indices reported — which demand indices (alpha, Q0, breakpoint, Pmax, essential value, R²) each study reports, plus their mean values

Status

The coding scheme above is finalized. Data collection has not yet started — this site currently ships with an empty dataset. As studies are coded, the index will update and this page will note the last refresh date and any inclusion criteria changes.

Methodology & inclusion criteria

To be documented once the systematic search and screening protocol is finalized.