I think both types of currency are important. Humans have basic needs which need to be met in the shape of atoms and joules which are quite storable. We also ha

I think both types of currency are important. Humans have basic needs which need to be met in the shape of atoms and joules which are quite storable. We also have luxury wants which translate better to watts. This separation might also be useful in the context of UBI schemes. And more generally I have a gut feeling, but can't quite substantiate, that many fairness problems stem from using the same currency for both, forcing the lower classes to work multiple jobs just to make basic needs while the haves compete with them just to improve their lifestyle and status.