Compare foraging group & food producing

Answer 1

Foraging groups tend to move around a lot. They are often hungry, depending upon what food they can find. Farmers tend to live in groups and produce as much food as they can eat -- and often a surplus.

http://en.wikipedia.org/wiki/Foraging

http://en.wikipedia.org/wiki/History_of_agriculture

Answer 2

The Potlatch: An Example of Negative Reciprocity. Why is this considered to be an unusual example of negative reciprocity?

Answer 3

http://anthro.palomar.edu/economy/econ_3.htm