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Grocery Shopping Under Simplified Marginal Value Theorem Predictions.

Tabea Schlender1, Alex Rieger1, Frank Eggert2

  • 1Institute of Psychology, Faculty of Life Sciences / Fakultät für Lebenswissenschaften, Technische Universität Braunschweig, Braunschweig, Germany.

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Summary

This study shows that the Marginal Value Theorem (MVT) can model human supermarket shopping behavior. The optimal foraging theory successfully predicts how shoppers balance time and gains in resource-rich environments.

Keywords:
Behavioral ecologyHuman behaviorMarginal value theoremOptimal foragingSupermarket

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Area of Science:

  • Behavioral Economics
  • Ecology
  • Psychology

Background:

  • Optimal foraging theory (OFT) explains how animals forage for food to maximize energy intake.
  • The Marginal Value Theorem (MVT) is a key component of OFT, modeling decisions about leaving a resource patch.
  • Supermarkets, as resource-dense environments, present a unique context for testing human foraging behavior.

Purpose of the Study:

  • To investigate if supermarkets function as 'patches' within the framework of the Marginal Value Theorem (MVT).
  • To determine if human food foraging in resource-dense supermarket settings can be modeled using MVT principles.
  • To quantitatively model the relationship between shopping time and monetary gains in a supermarket.

Main Methods:

  • Utilized the Marginal Value Theorem (MVT) to model the relationship between patch residence time and gains.
  • Collected data from 61 participants in a German supermarket regarding shopping trips and contextual variables.
  • Employed nonlinear orthogonal distance regression to fit an exponential growth model to patch residence time and gain data.

Main Results:

  • The study generally found relationships consistent with the MVT-based model.
  • An exponential function effectively modeled the trade-off between time spent shopping and monetary gains.
  • Some uncertainty existed in estimating the upper asymptote due to limited data on long shopping durations.

Conclusions:

  • The Marginal Value Theorem (MVT) provides a viable framework for understanding human shopping behavior in supermarkets.
  • Optimal foraging theory principles can be successfully applied to model consumer decisions in resource-rich environments.
  • Verbal reports from participants are sufficient for applying MVT-based models to human foraging behavior.