You need to purchase a vehicle from the dealership. Tell me exactly how you’re going to get that vehicle into your possession.
You need to think these things through, create a detailed scenario of this vision, how will it be implemented and how can it successfully work. I’ve tried this thought exercise, what you’re asking for… it’s impossible. There now has to be a medium (currency) to trade with. Or the world gets a reset button and we have to start from scratch again - that’s the only way bartering is going to work as a socioeconomic norm across the globe. Or maybe on a microlevel, a civil war that takes down the entire banking industry and we’d have to start from scratch in this country.