An index of the activities of daily living on a scale of 0-20. Its website is at http://www.strokecenter.org/trials/scales/barthel.html. See Florence I. Mahoney and Dorothea W. Barthel (1965), 'Functional evaluation: the Barthel Index', Maryland State Medical Journal, 14, 56-61.
An argument initially promulgated by William Baumol that accounts for the increasing share of service industries (like health care) in Gross Domestic Product. The phenomenon is explained in terms of steadily increasing productivity in capital-intensive industries, leading to steadily declining relative prices in those industries. The value (or the productivity) of health care is in general extremely imperfectly revealed in any known markets, even in situations where there are markets for care, so the story is a bit like Hamlet without the prince: the increasing share is visible but not the slow productivity growth. Despite this, and despite the high capital intensity of some modern medicine, and despite the fact that the efficiency of much health care remains untested, many regard Baumol's conjecture as having broad plausibility in health care. See William Baumol (1967), 'Macroeconomics of unbalanced growth: the anatomy of the urban crisis', American Economic Review, 57, 415-26.
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