PEDIATRICS Vol. 61 No. 3 March 1978, pp. 507
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Gresham's Law of Evidence

STUDENT

A recent review1 of the epidemiology of randomized clinical trials indicates very slow acceptance of this approach to evaluation of new medical treatments. If the proportion of randomized trials among therapeutic studies in gastroenterology continues to increase at the rate observed over the past decade, the reviewers estimate that the format will have taken over completely by the year 2010 provided the increase is exponential, and in about 700 years if it is linear. I write to suggest that a law, similar to Gresham's Law—cheap money will drive out dear money—operates in these matters.