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LoginThe concept of Cross Elasticity of Demand was initially propounded by H.L. Moore in his 1929 book Synthetic Economics, where he laid the early groundwork for measuring the responsiveness of demand for one good based on the price change of another. However, Robert Triffin is widely credited with providing the rigorous scientific explanation and formalization of the concept in his 1940 work, Monopolistic Competition and General Equilibrium Theory