"Of importance for the is that , in both his cycle books, had concentrated his energies on the statistical evidence of the economic interactions involved in the business cycle and the of these relationships rather than on the relation between the economic cycle and the exogenous causal factor. Moore's concern with evidence end statistical explanation compared to that of Jevons, and the matching change in contemporaries' responses, are both indicative of the development of the econometric approach by the early years of the twentieth century. Yet, it was some years before Moore's broad econometric approach to the explanation of economic cycles, involving a large number relationships linking different parts of the economy, was taken up by who produced the first macro econometric models in the late 1930s."