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Is there a magnitude effect in tipping?
Leonard Green1, Joel Myerson, Rachel Schneider
1Department of Psychology, Washington University, St. Louis, Missouri 63130, USA. lgreen@artsci.wustl.edu
Psychonomic Bulletin & Review
|August 19, 2003
Summary
Tipping behavior shows a linear relationship between tip and bill amounts. However, the percentage of the tip decreases as the bill increases, a phenomenon known as the magnitude effect.
Area of Science:
- Behavioral Economics
- Consumer Psychology
Background:
- Standard microeconomic theory suggests tipping is solely based on bill amount.
- Previous research indicated a magnitude effect in hypothetical tipping scenarios.
Purpose of the Study:
- To investigate real-world tipping behavior and the magnitude effect.
- To extend previous findings on tipping to actual consumer transactions.
Main Methods:
- Analysis of nearly 1,000 tipping records from taxicabs, hair salons, and restaurants.
- Statistical examination of the relationship between bill amount and tip amount.
Main Results:
- A consistent linear increase was observed between tip amount and bill amount across all establishments.
- A magnitude effect was identified: the percentage of the tip decreased as the bill amount increased.
- This contrasts with predictions from standard microeconomic theory.
Conclusions:
- The magnitude effect in tipping may be a mathematical artifact of expressing tips as a percentage, particularly when a base amount is included.
- A positive intercept in the tip-bill relationship suggests a component of the tip reflects a perceived fair wage, independent of the bill's total.
- This challenges purely utility-based explanations and suggests a 'fair wage' component in tipping decisions.