Abstract
This Forum article and the Forum article that follows are reprinted from articles that appeared in theSurvey of Current Business in the April 1994 issue with permission of the U.S. Department of Commerce, Bureau of Economic Analysis BE-64, Washington, D.C. 20230. These articles are being reprinted in the interest of readers ofNonrenewable Resources. The only changes from the original articles are those that were necessary to conform with the guidelines for Forum articles in the journal; these changes included the deletion of technical and qualifying information that was provided in foot-notes in the original articles. Bibliographic references are given at the end of the second Forum article.
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