Earlier quoted context omitted.
Supply and demand is and always has been a useful first-order approximation. Reality is a lot more complicated. Dear reader, never believe anyone who says a serious societal problem is "just" anything. Especially on the internet when they use merely a pesudonym to assert their authority. Especially when the person behind the pseudonym is a one-time washed-out author desperately clinging to their housing stock in Athe…
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What really exists, closest to the limit we will call "hard science" or "physics", is the microcosmic focus on individuals interacting in a market. Everything else -- supply and demand as a theory definitely included -- is a statistical extrapolation from micro-scale interactions. Hence the label of "dismal science". It's dismal because every hardline assumption is inevitably contravened by real life physics.