"Dynamic process analysis also liberates economists from the necessity of having separate theories of the “turning-points” in addition to theories of cumulative upward and downward swings. Even a simple theory of inventory cycles, or acceleration-multipliers, can explain all four phases of an idealized cycle. At its best, dynamic analysis can enrich our understanding of possibilities without leading to credulity in new, over-narrow, monistic dogmas concerning the cyclical process."
Paul Samuelson

January 1, 1970