Supply and demand (n.) trusted to regulate each other is the capitalists' superstition, so crude that even the factory inspectors remark on it with astonishment.
Supply and demand (n.) explain nothing until you explain what they rest on: social need, which drives demand, is at bottom shaped by class — by the split between wages and surplus-value.
Supply and demand (n.) cannot explain the inner laws of capitalist production, since those laws show themselves in pure form only when supply and demand cancel out and stop doing anything.
Supply and demand (n.) never coincide in any single case, yet always coincide over time — as the average of their perpetual contradiction.
Supply and demand (n.) can never balance for the capitalist: if what he put on the market merely matched what he took off it, his capital would have failed to be capital; his goal is the greatest possible excess of supply over demand.
Supply and demand (n.) hovers over the earth like the fate of the ancients, setting up and toppling empires — a power that would dissolve into nothing once men regulated production themselves.