The main issue with communism is human drive. What motivates you to go to work every day? What motivates you to do a good job? What motivates you to get a higher education?
The principles behind communism sounds great, everyone deserves equal treatment. Janitors are just as important as doctors to have a functioning society, so why pay them differently? However it is easy to see right where this breaks down, who is going to go through 8 years of med school so they can work long hours every day while being oncall all the time when they can just get a job right out of high school that pays exactly the same with the exact same benifits?
The greater good of your overall society is (sadly) not enough of a motivator for most people, and thus communism breaks down.
The reason capitolism works (better than any other system tried on a scaleable population in my opinion) is that it supposes that a person is naturally greedy/competative. People naturally want to get ahead of eachother and capitalism rewards that behavior.







