The real GOAT. Ludwig von Mises rebuilt economics from the foundation up, and a comparison to Einstein is not flattery: it is a structural observation about what each man did to his field. Einstein rewrote physics by showing that measurements of space and time depended on the observer's frame of reference. Mises did something comparably radical in 1912 with The Theory of Money and Credit, then again in 1920 with the socialist calculation paper, and definitively in 1949 with Human Action: he showed that economic calculation is impossible without private property in capital goods, because prices emerge only from voluntary exchange. The Soviet planners in Moscow were not making policy errors you could fix with better data. They were attempting something logically incoherent, the way you cannot find a square root of a color. Stalin murdered millions chasing a mathematical phantom that Mises proved impossible before the Soviet state was even ten years old. What separates Mises from most geniuses is the range. Einstein worked physics. Mises worked epistemology, monetary theory, capital theory, business cycle theory, and political philosophy simultaneously, weaving them into a single coherent system. His 1922 book Socialism predicted the collapse of every centrally planned economy with the precision of a structural engineer predicting which wall bears load. The Berlin Wall fell in 1989. The Soviet Union dissolved in 1991. The math was settled in 1922. The state, being an institution that lives by compulsion rather than consent, cannot tolerate this kind of clarity. Governments fund universities. Universities employ economists. Those economists publish papers justifying central banking, redistribution, and regulation, because tenure flows toward conclusions that flatter power. Mises spent years teaching in Vienna without a paid university position, funding himself through the Chamber of Commerce. He was excluded not because he was wrong, but because clarity about power's limits threatens the institutions that distribute tenure. You want to rank intellectual giants; let's rank them by what they overturned and what they built in its place. Mises overturned classical economics, demolished the theoretical case for socialism, and constructed a complete science of human choice on aprioristic foundations. Einstein, asked about Mises by journalist Henry Hazlitt in the 1940s, expressed genuine admiration. The greatest physicist of the 20th century respected the greatest economist. The tenured mediocrities who ignored Mises respected neither.