I was just wondering, what if a (relatively large) bunch of socialists just decided to accumulate capital as fast as humanly possible by volunteering some of their time at a collectively owned corporation? At some point capitalist firms in a few small markets would not be able to compete, so the socialist corporation could gradually transition into a regular worker cooperative and start attracting staff with wages. Eventually the cooperative would grow so large that it would wipe out some of its competition and carve a stable niche, with the added benefit that it would be controlled by socialists. Finally, as the vanguard party starts a revolution, this cooperative would economically support it, and would eventually become a de iure government-owned company.