Altruism has many denitions. Let’s use a strict denition: altruism is an act to help another person at a cost to the helper. We have spent time discussing whether helping behaviour is altruistic (Batson) or egoistic

(Cialdini). Without a doubt, both types of helping are present all around us. Consider the example of anonymous kidney donation.

Would you donate one of your kidneys anonymously? Why do you think some people are willing to do so? Do you think anonymous kidney donation is a purely seless act to help another person?