Things have different properties so they can (and should be) treated differently. What things should be nationalised and what privatised has been extensively a

Things have different properties so they can (and should be) treated differently. What things should be nationalised and what privatised has been extensively argued. We also have a lot of real world examples of what happens when you nationalise companies. The UK nationalised all its heavy industry and most of its light industry after WW2. It didn't go well. French nationalisation of its finance sector in the 70s didn't work great either. The things that are commonly nationalised are those that aren't huge, enormous, obvious, fast fuckups. Some countries do this better, some worse. But mostly it's kludges based on experience, not principles.