socialism doesn't believe in "reap what you sow" the state takes everything and redistributes it evenly.
capitalism is "reap what you sow' and also has a common goal, to prosper. All capitalists want money and to gain wealth, status and luxury. they only get or give what they have earned through labor or the market and cannot have anything they gain taken by the state for redistribution, as you have seen, America is a socialist corporatism and yet preaches the free market as if it had a true capitalism. Universal income caps also cause strife economically as there is less incentive to work harder because you get the same money as the janitor down the hall if your an executive. Also it causes strife based on the fact that the state still takes that money to redistribute it to the army, clinics and the governments coffers. Capitalism does not have a cap and many companies will compete with one another to get the most employee's by offering higher pay and benefits.
also to the idea that soc and com are different, modern communism is akin to socialism as Karl marx put both together to create a power pyramid that put him on top of the working class and to get everyone equal benifits due to the workers effort. But by reducing pay and ownership of property he made the citizens way of life miserable and hard. Famines, poor healthcare and homelessness of the working class was common and has occurred everywhere communism and socialism has been totally implemented.
as of the main question. The stock market is not a socialism, it is a form of corporatism that allows for some civillian interaction by buying and selling stocks which give the idea that you are earning money by investing in a company, this however if not the case. The company owners will most of the time own the majority of stocks and thus they retain the most power, meaning you are earning money but the money you invest is used by the company to further their income rather than yours. so it is not a socialist system as it is also voluntary.