I guess Marshall would argue that if there were no wealth redistribution scheme, all the non-executives would simply die off, followed by all the executives who made stuff for them, until eventually only a micro-economy existed of executives making stuff for other executives.
I agree that Marshall is concentrating too much on one side of the economic equation, though. He ignores that people could form less efficient micro-economies rather than die off. He ignores that human desire is ever-changing and limitless, capable of out-stripping the most efficient production facility. And he ignores the fact that people have intrinsic value to other people apart from employment: to interact with, to command, to love. People will pay to keep other people alive and happy.
I agree that Marshall is concentrating too much on one side of the economic equation, though. He ignores that people could form less efficient micro-economies rather than die off. He ignores that human desire is ever-changing and limitless, capable of out-stripping the most efficient production facility. And he ignores the fact that people have intrinsic value to other people apart from employment: to interact with, to command, to love. People will pay to keep other people alive and happy.