Socialism:
You have two cows and you are obliged to give one to your neighbour.

Communism:
You have two cows. The Government takes both and gives you the milk.

Fascism:
You have two cows. The Government takes both and sells you the milk.

Nazism:
You have two cows. The Government takes both and shoots you.

Bureaucratism:
You have two cows. The Government takes them both, shoots one, milks the other one, then throws the milk away.

Totalitarianism:
You have two cows. The Government takes both and denies that they ever existed. Milk is banned.

Capitalism:
You have two cows. You sell one and buy a bull.