What a lovely Marxist idea:  all work is done to benefit society as a whole.   How well does it work?

During the 20th century, the Soviet Union and and Communist China conducted a couple of tests of Marx's theories, and and unfortunately 7 million Soviets and 30 million Chinese died as a result. 

However, there was was a more controlled scientific test of Marx's theories conducted in a couple of countries. It was simple. Take a country, divide it in half, operate one half under Marxist theory and use the other half as a control group. At the end of the experiment, East Germany had 1/4 of the per capita income of West Germany, so the experiment was ended on humanitarian grounds. We're still waiting for the results of North Korea vs South Korea experiment, but at this point in time North Korea has 1/20 of the per capita income of South Korea. We're hoping someone will bring that experiment to an end soon before all the North Koreans starve to death.