I may be wrong here but...<p>I dont think chimpanzees have a firm grasp on economics or even an analogous example; chimps don't think about spending banana's to make more bananas in the long run. Chimps arent thinking about trading banana's for shelter or safety or manual labor.<p>"In the game, a human or chimpanzee who receives something of value can offer to share it with another."<p>Also, from what I gathered from that article the people and chimps have to work to get something, then they can choose to share it. Why would they share? Person or Chimp? That would be real self-interest.<p>I mean if you are forced to make an offer and you know your counterpart is not as smart as you...let's say a chimp, you would be dumb not to offer less. <p>That's just my two cents.