I like to take a Mutualist position on it. Things should only be socialized to their direct stakeholders. So most companies would be worker coöps. Utilities would be consumer worker coöps. And large interstate transit would be federal. Universal healthcare would fall into the later as a largescale consumer coöp.
*Capital markets. Commodity markets are fine as long as you align stakeholders with ownership. So worker and consumer coöps. Rental and housing coöps are a great example.