Regarding my disdain for talking about “Contradictions in Capitalism”:
My choice of animals as an example was quite deliberate. The idea that “contradictions” within a system will collapse it is in contrast to how systems are physically realized. This world is chock full of animals that are slowly destroyed by the very same chemical processes that enable them to live and grow in the first place. Some aspects of aging, particularly ones aimed at preventing unregulated cell multiplication, are most likely anti-cancer mechanisms. Cancer itself could be read similarly - the same mechanisms of cell replication we depend on to exist will almost inevitably become corrupted through prolonged use and environmental damage and eventually turn on us.
Other things that are contradictory on the surface may be, at deeper levels, attempts to adapt to physical constraints.
So, to me, talking about “contradictions in capitalism” feels a lot like saying “hah, that elephant is a product of cell replication, but cell replication will eventually destroy him!” It doesn’t feel like any sort of deep insight, and despite the inevitable destruction of the original elephant, elephants continue on anyway.
One might as well talk about “Contradictions in Communism” as applied to mere human beings at that rate. If systems are actually destroyed through internal systematic/philosophical contradictions, then surely it must have them.
(Someone actually ideologically committed to Capitalism on a moral level, rather than someone who considers it an amoral (not immoral) resource allocation algorithm to be cynically used, would be better-suited to fishing out “Contradictions in Communism”. I don’t think in a “Contradictions in X” way about systems generally, so I never bothered to cache such things.)
Any replacement system will still require profit of some kind, since circumstances inevitably vary, and without net profit you’ll have to eventually eat into your capital during tough years, until it is finally depleted.