Default Effect

In three conferences, participants were divided into two groups:

1. Standard menu registration with the option to choose vegetarian 
2. Vegetarian menu registration with the option to choose non-vegetarian.  

In group 1 only 6% ate a vegetarian menu in contrast to 87% in group 2. 

When faced with different options, we tend to stick with the one selected by default.

See the full study here :

 Hansen, Schilling & Malthesen (2019). Nudging healthy and sustainable food choices: three randomized controlled field experiments using a vegetarian lunch default as normative signal.

Want to know more about biases?


The Less is Better Effect

Creativity Bias

Peak-End Rule