Before to speak about communism, a socialism and capitalism, it is necessary it will be defined with terms. As an educational program a roller: https://www.youtube.com/watch?v=dHH13eR5J1I the Main line of capitalism: these are instruments of labor bourgeoisies belong, it takes away all profit, the state is not enough in it interferes, the Main line of a socialism: instruments of labor belong or bourgeoisies, but the state takes away the most part of profit and arranges, or as in the USSR instruments of labor belonged to the state, however as well as profit. The main line of communism: instruments of labor belong to workers. Examples from an antiquity: artel, the handicraftsman, a common example from the present: the startup, which else is not present any hired worker. Opensource the same communism as the instrument of labor and results belong to community. If to tell about the USSR instruments of labor belonged to the state and as consequence the state built system as it is accepted in each separate firm - planning... I.e. a planned economy. I.e. Accurately to plan consumption and demand... The notorious human factor became the Main lack of such system: what for to work, if and so you will receive the blessings, and the tendency in consumption was not given by varieties... In general it turned out many many factors which to consider and calculate not probably... As to system not evolutionary - with feeble variability and without selection, eventually it it appeared it is not steady... It was feeblly set up under needs of a society and changing world... Capitalism is fine evolutionary model... Which is steadiest. In it attempt to earn, receive a profit leads to variability, and supply and demand laws lead to selection... Capitalism is cyclic, in it permanently there are crises... As the selection form... It naturally and living in such economy to crises it is necessary to be ready. . This problem also tried to solve Marx and Engels, trying to rebuild system, to leave from crises and attempt to plan and calculate is one of these ways... The person is reasonable... Actually absence and recurrence causes to that the first who suffers is a proletarian... Problems are at his expense solved... And here the human factor is again important... What for to plow on the capitalist for pennies when it is possible not to work, but also to plunder it... Eventually the capital came to a conclusion, especially against the USSR that costs shares also the majority of the countries of Europe there was as a matter of fact a social capitalism... When the capital pays not small taxes... On it all over the world there are now two tendencies - the big socialization, socialist parties. There are also their antagonists - is more right to the capital, it is less taxes... Normally it is conservatives... opposite to a socialism and communism is a fascism, there the liberal economy was in favor of industrial sector. . All of us we remember in Germany mega corporations that received during the Second World War... The Same company IBM received profits of the third Reich on the railways on which carried people in a concentration camp... Or Coca-Cola... Or for example as a matter of fact dictatorship in Greece (black generals) or in Chile or the most successful example - South Korea... Where till 1991 there was a military dictatorship... And all worked and work till now without social warranties (there there are no paid holidays, there are no sick-lists)... In general here so... Here there is no correct or is not correct, and there are different levels of control and possibility to calculate for them, to plan... For example business the plan quite to itself a normal thing, here costs as in stability of model... And other factors.