ABSTRACT
The cycle approach has led to some very full morphological studies, in particular on the part of the researchers of the NBER. J. Shiskin (1967? and G. H. Moore (1980) give an exposition of some post-war developments of this approach, extended to the case of growth cycles by lise Mintz. The cycle approach received less interest between World War II and recent years, being challenged by Keynesian theories aiming more at causal explanation and at structural prediction than at the description of temporal regularities. So we will only occasionally address ourselves to the problem of the cycle in this sense.
