An important identifying assumption for business cycle models is contained in the mathematical form of the model, which determines the nature of its possible movements. Tinbergen's and Frisch's original understanding of business cycle theories was that of a closed model, containing only...

Because of one algebraic mistake in the works of Tinbergen, Neuberg comes to the conclusion that the pre-Haavelmo research "ultimately failed to under- stand changes in business variables as cyclic harmonic motion" and "Morgan does not convey the failure." What went wrong in the pre-Haavelmo...