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Health Serv Res. 1978 Winter; 13(4): 351–368.
PMCID: PMC1072078

Demand for general practitioner and internist services.


Demand equations for general-practitioner and internist visits were estimated from 1970 CHAS-NORC survey data on health-service utilization and expenditure. Because a large proportion of respondents reported zero visits, observations were grouped according to cross-classified independent variables and regression analyses were performed using group means as data. The results showed significant differences between demand equations for general-practitioner visits and those for internist visits. Of potential importance was an apparent substitution of internists for general practitioners as ability to pay (income or insurance coverage) increased. Own-price elasticities were low for both general practitioners and internists but were even lower for the latter (0.1 to 0.02) than the former (0.2 to 0.3). The demand for services of the two specialties also differed with respect to disability days, age, sex, residence, and race.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Kimbell LJ, Lorant JH. Physician productivity and returns to scale. Health Serv Res. 1977 Winter;12(4):367–379. [PMC free article] [PubMed]
  • Guzick DS, Jahiel RI. Distribution of private practice offices of physicians with specified characteristics among urban neighborhoods. Med Care. 1976 Jun;14(6):469–488. [PubMed]
  • Berki SE, Kobashigawa B. Socioeconomic and need determinants of ambulatory care use: path analysis of the 1970 Health Interview Survey data. Med Care. 1976 May;14(5):405–421. [PubMed]
  • Hershey JC, Luft HS, Gianaris JM. Making sense out of utilization data. Med Care. 1975 Oct;13(10):838–854. [PubMed]
  • Wirick GC., Jr A multiple equation model of demand for health care. Health Serv Res. 1966 Winter;1(3):301–346. [PMC free article] [PubMed]

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