Knowledge that Transforms

A MONG THE BIG unsettled questions of modrem history and economic history, four loom large-the industrial revolution, the French revolution, the German inflation of the 1920s, and the world depression of the 1930s. All are still studied, debated giving rise to many theories, mostly mono-causal and conflicting. More unsettled questions may be on the way, for example the inflation of the 1980s and the stagnation of the early 1990s. But Gerald Feldman has written a big book that must be taken into account in any discussion of the German inflation, big in many senses, 1000 pages of double-column print (triple columns in the index), 4.48 pounds in weight at my local supermarket, and covering in the order of the subtitle the politics, economics, and sociology of this pathological episode. Specialists in any one discipline may find their own discipline relatively neglected, especially economists who tend to want more theory, as D. C. Coleman indicates, who asserts that theories are what economists make, while historians need evidence (1969, p. 8). The evidence here is prodigious: 49 tables, two-thirds that number of photographs and illustrations, 85 pages of endnotes, 24 pages of bibliography, and a 42-page index, the work of 15 years of study of the subject and 43 earlier publications of Feldman-books, articles, and edited work, some with colleagues, mostly his own. The feast is rich; some economists and economic historians may find it too rich for ready digestion. Feldman is aware of his problem in combining contradictory modes of analysis, but believes it necessary. Partly in a reaction to the work of Carl-Ludwig Holtfrerich whose The German Inflation, 1914-1923 (1986) concludes that the results of the inflation on balance were favorable in giving Germany years of investment and full employment in a largely depressed world and ridding it of private foreign and all internal debt, he asserts:

casual empiricism, invalid use of inverse probability, introduction of factors external to the theoretical system, and the use of only some of the implications of a formal model that has others that are unrealistic. . . . The basic sources of the defects in Lange's theoretical analysis are the emphasis on formal structure, the attempt to generalize without first specifying in detail the facts to be generalized, and the failure to recognize that the ultimate test of the validity of a theory is not conformity to the canons of formal logic but the ability to deduce facts that have not yet been observed, that are capable of being contradicted by observation, that subsequent observation does not contradict. In consequence, these defects are found in much economic theorizing that is not taxonomic in character. They are, however, especially likely to arise when the taxonomic approach is adopted, as their presence in the writings of saable and careful a theorist as Lange testifies. (Friedman 1946, p. 631) Shortly after the publication of the piece on Lange, Friedman received a probing letter from Edwin Bidwell Wilson. That letter, Friedman's reply, and a second letter of Wilson's are reprinted below. E. B. Wilson (1879-1964) was a scientific generalist of a type that has always been uncommon, and is becoming unknown. Wilson studied under the mathematical physicist J. Willard Gibbs, and his publication of Gibbs' notes on vector analysis and a text of his own on advanced calculus had a great impact upon education in advanced mathematics in the early part of this century. Wilson held faculty positions in mathematics at Yale and mathematics and physics at M.I.T. before he moved in 1922 from being the Chairman of Physics at M.I.T. to Harvard to be Professor of Vital Statistics in the Harvard School of Public Health, a position he held until his retirement. In 1914 he was appointed Managing Editor of the Proceedings of the National Academy of Sciences, a post he held for fifty years, until his death. In 1929 he served as President of the American Statistical

Estimation and Inference in Econometrics, Russell Davidson and James G. MacKinnon, Oxford University Press, 1993, 874 + xx pages (Designated DM). A Course in Econometrics, Arthur S. Goldberger, Harvard University Press, 1991, 405 + xvii pages (Designated GO). Econometric Analysis, second edition, William H. Greene, Macmillan, New York, 1993, 791 + xxii pages (Designated GR). Learning and Practicing Econometrics, William E. Griffiths, R. Carter Hill, and George G. Judge, John Wiley, New York, 1993, 866 + xxv pages (Designated GHJ).

This paper reviews and interprets from an economic perspective the demographic trends in the U.S. since the turn of the century. The primary focus will be upon the interplay between the fertility and labor force participation of women and how they may be interpreted within simple economic models....We will begin by stating what economic demography is and why careful analytic methods are needed. Section II provides a brief demographic history of the U.S. Section III describes the major economic theories of fertility and Section IV discusses the empirical performance of these theories. Section V discusses the linkages between fertility and the size of the labor force and Section VI concludes. (EXCERPT)