I'm short on cash these days. I'm making decent money, it's just not a lot of it is actually getting to me. Thus, I don't have triple digits required to say... put new breaks on my car.
Enter my housemate Dave. Dave could have been a mechanic, but decided that doing it for a living would ruin the fun of it. So when I ask him if he knows a good mechanic in town, he leaped at the chance to play with his tools.
So my car spent the last few hours getting tuned up all for the price of a six pack of beer and some smokes. This also notes the first time in my life I ever bought cigarettes. (What can I say, I like my lungs too much.)
So my point is that the barter system rocks. I could easily acquire the goods Dave desired, and he was more than happy to provide the service I needed. Money is overrated. Viva la barter system.