Cambios intra-sesión en la elasticidad de la demanda por comida en ratas

Translated title of the contribution: Within-session changes in rats' food-demand elasticity

Vanessa Minervini, Chad M. Galuska, David R. Maguire

Research output: Contribution to journalArticlepeer-review


A common finding in behavioral economics is that demand assessed under an open economy is more elastic than that obtained under a closed economy. Although elasticity traditionally has been conceptualized in terms of price sensitivity, a potential confounding variable is session duration because open economies typically arrange markedly briefer sessions than closed economies. To assess the role of session duration on demand elasticity, we arranged an open economy in which 6 male Long-Evans rats lever-pressed for food and water reinforcers in 1-and 6-hr sessions. The fixed ratio for food reinforcers increased across sessions. Both reinforcer magnitude (1 or 2 pellets) and session duration were manipulated across conditions. Cumulative hourly food consumption data were fit to both the linear and exponential demand models such that the elasticity parameters yielded could be compared. For all rats, as time within the session elapsed, cumulative exponential demand for food became progressively less elastic, as did initial linear demand elasticity; however cumulative linear demand for food remained relatively unchanged for 5 of 6 rats. These results suggest that session duration modulates only initial demand elasticity with small price increases, and that these changes do not reflect changes in price sensitivity. Thus, session duration does not appear to account for the differences in elasticity previously obtained under open and closed economies.

Translated title of the contributionWithin-session changes in rats' food-demand elasticity
Original languageSpanish
Pages (from-to)35-61
Number of pages27
JournalRevista Mexicana de Analisis de la Conducta
Issue number1
StatePublished - 2013


  • Behavioral economics
  • Closed economy
  • Demand elasticity
  • Lever press
  • Open economy
  • Rats

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Applied Psychology


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