While I'm certainly not a fan of communism or any system that concentrates authority in a smaller number of bullyboy hands, I do respect Karl Marx's economic theories. Compound interest rewards those who save - who tend to be those ABLE to save. If you are born to slaves or paupers, and have no choice but to lift your bucket where it is and lift as you climb, you are extremely unlikely to become self-made in a single generation.
It's the Recycling Economy Stupid.
That said, teaching people that it is hopeless to lift their buckets as they climb is cruel and unusual, historically speaking. The empowerment of resentment - Marx's elixer for proletariat revolution - has little evidence of building wealth in society at large. Most people benefit from a smaller slice of a bigger pie than taking away another person's piece and re-distributing it among sharp elbowed bullies.