The Estimation of Prewar GNP: Methodology and New Evidence

The paper develops new methodology for the estimation of prewar GNP, taps previously unused data sources, and develops new estimates for the periods 1869-08 and 1869-28. Primary among the new data sources are direct measures of output in the transportation, communications, and construction sectors, and estimates of the consumer price index. New measures of real GNP, nominal GNP, and the GNP deflator are developed. The new estimates of real GNP are as volatile on average over the business cycle as the traditional Kuznets-Kendrick aeries but dampen the amplitude of some cycles while raising the amplitude of others. The new estimates of the GNP deflator are distinctly less volatile than the traditional series and in fact no more volatile than in the postwar period.

The Estimation of Prewar GNP Volatility, 1869-1938

New evidence is provided to assess the recent controversy regarding the volatility of real economic activity before 1929 relative to the period since World War II. Some recent work claims that the longstanding stylized fact of greater prewar volatility is "spurious". In contrast, this paper reconfirms the greater amplitude of business fluctuations prior to the Great Depression. The basic technique is the regression method, which estimates equations for real GNP during 1909-38, with one or more explanatory variables for components of GNP, and then uses the estimated coefficients to "backcast" real GNP or the period 1869-1908. The paper contains an extensive examination of the sensitivity of these regression indexes to alternative dependent variables, sample periods, detrending methods, and the inclusion of alternative explanatory variables. Particular attention is paid to the conflicting evidence regarding the amplitude of cycles in construction activity between 1870 and 1890. The resulting prewar/postwar volatility ratios, for 1869-1928 as compared to 1950-1980, range from 1.43 to 2.16. The paper concludes by suggesting that this range of volatility ratios is more likely to understate than overstate the prewar/postwar volatility ratio.

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Publikacja recenzowana / Peer-reviewed publicatio

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Validation of the Forensic Assessment Interview Technique

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