Where does money come from?

So this week Lorelei has been turning on and turning off lights around the house. First she turns them all on and then a little while later goes and turns them all off. Finally last night, she starts flipping the switch in the family room. I said, "Lorelei, please stop switching the light on and off, you are wasting electricty and it costs a lot of money," (Like she really is going to understand the meaning of that.) Then she asks, "Mom, can I come with you." I say, "Where are we going?" She says "To the store to get some more money." We all had a good laugh about that one. Apparently, she thinks we get everything at the store.