Prof. Carl Menger (1840-1921) was credited for discovering, apart from but simultaneously with Jevons and Walras, subjective marginalism in economic behaviour. He was called the founder of the Austrian School, co-called (by the British) because of their Vienna roots.
His legacy knows a strong tradition in the USA. Prof. Carl Menger stongly opposed equilibrium theories, proving these to be dualistic, positivist and plainly wrong. Neither was Menger a Quantity Theorist. That is why Prof. Antal Fekete proposed a disequilibrium theory of economics.
Economics today have deviated from C. Menger's discovery. To no avail have they come up with useless models and political theories, the consequences of which we all suffer today. Time for a new school. And a decent methodology.