Kondratiev long wave models take many forms. The most popular are those emphasizing a technological innovations story, e.g. Joseph Schumpeter, _Business Cycles_, 1939; Gerhard Mensch, _The Technological Stalemate_, 1975; Richard Goodwin, "The Economy as an Evolutionary Pulsator," _Journal of Economic Behavior and Organization_, 1986, and Andrew Tylecote, "History as a Forecasting Tool: The future of the European economy in a long wave/long cycle perspective," _Review of Political Economy_, 1993; Other approaches include a class struggle theory, e.g. Leon Trotsky, "The Curve of Capitalist Development," (1923) in _Problems of Everyday Life_, 1973; Ernest Mandel, _Long Waves of Capitalist Development_, 1980; a labor shortage theory, e.g. C. Freeman, J. Clark, and L. Soete, _Unemployment and technical innovation: A study of long waves and economic development_, 1982; K.B.T. Thio, "On simultaneous explanation of long and medium-term employment cycles," _De Economist_, 1991; an energy-raw materials shortage theory, e.g. W.W. Rostow, "Kondratieff, Schumpeter and Kuznets: Trend Periods Revisited," _Journal of Economic History_, 1975; George F. Ray, "Energy and the Long Cycles," _Energy Economics_, 1983; a capital self-ordering model, e.g. Jay W. Forrester, "Growth Cycles," _De Economist_, 1977; John D. Sterman, "A behavioral model of the economic long wave," _Journal of Economic Behavior and Organization_, 1985; a socialist investment wave model, e.g. J.B. Rosser and M.V. Rosser, "Long Wave Chaos and Systemic Economic Transformation," _World Futures_, 1994, and a cultural/political model, e.g. J.Z. Namenwirth, "Wheels of Time and the interdependence of value change in America," _Journal of Interdisciplinary History_, 1973. More general references on long waves include: J. van Duijn, _The Long Wave in Economics_, 1979; C. Freeman, ed., _Long Waves in the World Economy_, 1984; Joshua Goldstein, _Long Cycles: Prosperity and War in the Modern Age_, 1988; Jan Reijnders, _Long Waves in Economic Development_, 1990. I note that there has been a major revival of interest in Kondratiev in Russia recently, including a major conference on the 100th anniversary of his birth in 1992 in Moscow with a series of papers presented at that time. Stalin had Kondratiev killed in 1937 for "formalism." That a lot of the above publications are by Dutch economists or in Dutch journals such as _De Economist_ reflects the fact that the originator of the long wave model was not Kondratiev (who published in 1922 in German originally) but a Dutch economist, J. van Gelderen. His never-translated-into-English original work was "Springvloed: Beschouwingen over industrieele ontwikkeling en prijsbeweging," _De Nieuwe Tijd_, 1913, 4-6. Needless to say, if the long wavers are right, we should be nearing the beginning of a long upswing. We shall see. Barkley Rosser Department of Economics James Madison University Harrisonburg, VA 22807 USA