Answer
The major similarities between capitalism, socialism, and communism are that they are all economic systems that seek to organize the production and distribution of goods and services. The major differences are that capitalism is based on private ownership of the means of production, socialism is based on public ownership of the means of production, and communism is based on collective ownership of the means of production. No, I was not surprised to learn that there has never been a true communist country in the world, as communism is a difficult system to implement and maintain.