Where would be be if it hadn't been for the proletariat ? No industrial revolution.
Thought the proletariat sprung up out of the industrial revolution, being part of marxist theory (itself a reaction to capitalism, of course)? Unless you decide to apply the term retroactively, I suppose.
Something you said earlier:
In truth, despite the fact that it would appear otherwise, economics is a precise science
Rubbish. Define a precise way to measure unemployment and inflation, then. Define a precise way to measure the submerged economy when calculating unemployment. It's not precise - it's getting better, it might be able to measure trends, but it's a long way off accurate predictions which surely is a fundamental part of a "precise science".