A general two-constraint model of consumer demand

Carlos E. Carpio, Michael K. Wohlgenant

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We generalise a two-constraint model of consumer demand so as to make utility a function of both consumption of the good and the time allocated to consumption, to accommodate the fact that the consumer may derive utility from the time spent acquiring and/or consuming the good. We use the comparative static results to specify demand systems consistent with this theory and develop an econometric approach to estimate the demand parameters. The model is used to obtain empirical demand functions for customers visiting pick-your-own fruit farms, where customers choose between harvesting fruit themselves and buying pre-harvested fruit on the farm.

Original languageEnglish
Pages (from-to)433-452
Number of pages20
JournalEuropean Review of Agricultural Economics
Issue number4
StatePublished - Dec 2010


  • incomplete demand systems
  • on-farm sales
  • opportunity cost of time
  • time-dependent utility function


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