Briefly explain: why it is so difficult to tease out of the Ultimatum Game an understanding of whether proposers are motivated by altruism.

1.      Briefly explain:

a.      why it is so difficult to tease out of the Ultimatum Game an understanding of whether proposers are motivated by altruism.

b.      why behavioral economists turned to the Dictator Game in an attempt to understand whether proposers are motivated by altruism or not.