Economics… >.< Think hard

Hmmm economics well I think of money you know that $$$, the dough, the power in the world.  I also think of social studies.  Not alot of people like economics I don’t I'm more of a math person.  Well first off economists to me is I buy something from someone i give him $ he gives me for example a video game.  Later I sell the video game for $.  So if you want something from someone you give them money for that thing and vice-versa.  Well i challenge you to try this at a store but don't get something you don't want. Why would you??