One way or another, quite a few of us have a hard time with saving-up income with what we have. Plus, many of us end up having a lot more clutter in our homes that ends-up sitting there. We even feel we have to get rid of a ton of our own clutter anyways!
This is why I propose a system of going through with money or trade as a payment for lots of options. So if you are at a shop, trading-off a shelf item for something of yours for the same value would be an option!
I have seen this happen in movies a couple of times, but I have not actually witnessed this in real life. Whether this was something in the past or invented for later, I say we could have this now!