In context: the fact of someones lower tier on the production ladder makes him or her entitled to ownership of the whole apparatus, - those who do the manual labour which can be done by the uneducated are the true owners of the process.
In broader terms, the implication: Marxism beholds the fate of the downtrodden as the guarantee of their destiny as rulers.
The effect, because humanity is opportunistic and often enough stupid, is that al those who are for some natural reason not qualified for positions of power acquire these positions precisely because they aren’t qualified.
Marx has three notions of value;
Use value, exchange value and human-labour-intensity. These 3 do indeed exist. He manages however to conclude from completely illegitimate argumentation in the outset that all these three values reduce to human-labour-intensity.
He claims that value is ultimately sufficiently and comprehensively defined as that amount of human labour that goes into that thing.
He does not consider that nature has done her labour on the produce before man puts his hands on it, nor does he consider that a things value is the result of someone wanting to have it.
Mind you this is the very outset of his argument. The errors he proceeds on making beyond are based on this ludicrous, but utterly ridiculous failure at thinking.
As a result, the worst have a natural right to the most. Thus, society is ruined and along it the earth, as Marx paves the way for the path for the least labour and the greatest consumption; the consumer society.
The stupidity of his argument and that no one but me has even understood how stupid it is make it all the more laughable that someone recently implied that I am after all a Marxist. No, my dear fellow Huulugun, I am not. I simply have the East in my blood, it is in our heritage and many good men have tried to make something of it and failed. I am not such a man. I am beyond good and evil, I understand that value is what gives. Hail the worker - qua his work, as long as it is good. Hail the Pharaoh, qua his gold, as long as he is glorious.
Hail Nietzsche!