Why Do I Need Those Scissors?

In Adam smith's new way of looking at things, people's vices can actually serve to benefit society as a whole. People are willingly living their lives each day improving the world that we live in not because they're gondy but out of their own self interest. For example, what if this person loves bread so much that they decide to specialize in bread making? And it has nothing to do with us waiting around for some altruistic person to build a better mouse trap for us. No, it's a human characteristic to make bargains and try to get what we want from the other person.