Merely saying isolation is a theoretical possiblity is different from espousing it. And an isolationist society is just as likely to be capitalist as socialist.
The capitalists would just have to work harder to achieve a high standard of living, leaving less left over for profligates and parasites.
I didn't say that what you said about an ISOLATIONIST SOCIETY was MARXIST; rather it was your snippy remark about America/Americans being too rich for their own good.
Please don't put words in my mouth, nor confuse what I have clearly posted.
You've been handily refuted; just bow out now and it'll all go away. :-)