You can still sell a Roman Aureus gold coin. I think the challenge of the future will be penetrating centralized controlled financial systems and governments to educate people how to transact permissionless. The economies that just started their decline in 2018 and were previously in decline tend to be the ones people have the hardest time learning how to stop participating in. New and emerging economies will have these advantages instinctively, But the society they live in will still need centralized development. I think this issue comes to a personal education perspective. A centralized government can educate its employees how to deter free thought towards this pristine asset much easier than an unorganized decentralized mass of people.