In Focus: Effects of an Opportune Gift on Tipping

These are the raw data as .sav files used in the manuscript "In Focus: Effects of an Opportune Gift on Tipping " by Frederic Hilkenmeier & Sascha Hoffmann (DOI: 10.1177/10963480211019841)

The present study analyzes the effect on tipping when a gift is offered by servers, and shows that customers generously reciprocate that gift by significantly increasing gratuity. Making the norm of reciprocity focal by offering the identical gift at an opportunity to directly reciprocate, i.e. concurrently with bringing the bill, even doubles this effect, indicating that service personnel can substantially - and effortlessly - raise their tips just by leveraging this reciprocity norm.

Experiment 1:
data: Experiment_1_Full.sav

Statistical Analysis: ANCOVA
IV: Experimental Condition
DV: Gratuity_percentage
Covariate: Billsize

As described in the manuscript, we also provide a Reduced Dataset with only 54 subjects (dinner parties) per condition (Experiment_1_Reduced.sav).

Experiment 2:
data: Experiment_2.sav

IV: Experimental Condition
DV: Gratuity_percentage
Covariates: Billsize, Temperature, workday/weekend, lunch/dinner, alcohol consumption, number of adults, children, gender of person paying