Marxism has a number of inherent contradictions, which unfortunately, are more immediate than the contradictions in Capitalism.
In Marxism, the income from workers' work is pooled, and redistributed. The effect of this is to assure that one gets paid without regard to how well, or hard one works. For many people, this is an invitation to work poorly, or not at all. One effect of this is to lower production. Another is to produce a feeling of apathy- even of one works hard, there is still no visible effect on one's life.
A more general form of the same (pricing) problem is that prices are set by a central pricing authority. Therefore, they reflect a theoretical calculation, rather than actual scarcities. The effect is to cause tremendous waste, as people use scarce (less-efficient), but lower-priced items in place of common (more-efficient,) higher-priced items.
In Marxism, investment decisions are centralized, and this may be the greatest source of waste, because it causes the economy to grow at a lower rate. The central managers are unaware of most of the advantageous investment opportunities. There is no way to get the information to them, because any such communication channel is quickly clogged with foolish, inaccurate requests for investment. In most capitalist countries, people simply invest, and if they invest inaccurately, they lose their investment. Folly is self-limiting, and success is self-reinforcing.
Marxism is also a form of Socialism, and Socialism has several more general problems. See Socialism.
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