the people who started exchanging labor for money and today are billionaires, which "class" do they belong to? What if you work and ALSO invest in another compa

the people who started exchanging labor for money and today are billionaires, which "class" do they belong to? What if you work and ALSO invest in another company? What if you work 10 hours a day in your own company? Once you amass capital, there's no need to apply any kind of effort? Capital is indestructible? How many times should we try communism?