All wealth is collective by nature in the sense that it relies on the work of hundreds, thousands, millions of engineers, technicians, the accumulation of knowledge. Then, private property is a social construction that we invent in order to organize economic and social relations. It’s a very useful social invention as long as you keep under control how much you can accumulate, how much power you can concentrate, etc. But none of these assets are their assets. They are a product of a collective process. No one invented anything by himself or herself.