Hey Josh, when I sold craigslist stuff to some college kids, they wanted to use apps to trade money instead of cash.
There's always swap meets and barter...and not bringing your cell phone.
I've been thinking that if there was some A.I. system where everything was transparent, it would prevent a lot of crime. Its like stone age villagers that live under the same roof. You can't hide anything from your kin so that encourages good behavior.
The problem is twofold. One is someone gets to determine what is good behaviour, the other is it's all done by force. But let us enjoy the freedom of the airwaves while it lasts! Invisible airwaves crackle with life, Bright antenna bristle with the energy.