traditional, command, market, and mixed economic systems

1.)There are four types of economic systems; traditional, command, market, and mixed. Which one does communism fall under? Identify a country that has a communist economic system? What is the impact? Is it functioning and sustainable? 2.)Considering the four types of economic systems; traditional, command, market, and mixed, which type is socialism? What led to the emergence of socialism? What are the benefits and drawbacks of this economic system?