An official website of the United States government
Here's how you know
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Average niceness ratings of givers by adults and children in Study 2 when they gave 20% or 50% of their resources obtained through individual or collaborative effort. 1 = very, very mean and 7 = very, very nice. Error bars represent standard error.