1. (1)J. AKERMAN , Ekonomisk teori, II, Lund1944 , p. 123 -124 .
2. (2)J. AKERMAN ,Ekonomiskt skeende och politiska forandringar, Lund1946 .
3. (1)Cf.H. T. DAVIS , The Theory of Econometrics , Bloomington, Ind.1941 , p. 441 to441 , on "the role of cycles in American history". Prof. Davis draws on the basis of four series of yearly data very much the same conclusions-onthisrelationship, i. e. political events as functions of economic change-as the author on the foundation of a quarterly index of another economic series against the background of historical description. Prof. Davis' interesting book has quite recently become available in Sweden.
4. (1)The building cycles have been analysed by J. R. RIGGLEMAN,Building Cycles in the United States1875-1932 , Journal of the American Statistical Association , 1933; C. F. Roos,Dynamic Economics, Bloomington, Ind. 1934, ch. VI; C. D. LONG,Long Cycles in the Building Industry, Quarterly Journal of Economics, 1939; J. TINBERGEN,Statistical Testing of Business Cycle Theories, Geneva 1939; J. B. D. DERKSEN,Long Cycles in Residential Building: an Explanation, Econometrica, 1940.