Your roommate arrives home and says, "i am so hungry. i would give up my iphone for a bowl of chili right now." you're famished, too, but you say, "here is my chili-let's trade." yor have a time preference than your roommate, because o weaker: you're willing to make trades proposed by others o weaker: you're willing to give up an immediate benefit for a long-term one o stronger: you consider communicating more important than eating o weaker: your roommate is getting what he wants from you o stronger: you are able to think more rationally about your choices