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This paper analyzes a national sample of firms where employees faced a choice between a Health Maintenance Organization (HMO) and a conventional insurer such as Blue Cross. A regression analysis is specified as a partial adjustment model and a logit functional form. The long-run price elasticity of demand for HMOs is estimated to be -0.6. To the extent that employers pass on increases in the total premium, the price elasticities facing insurers are higher. Furthermore, the demand for HMOs is a negative function of the copayment charged by the HMO for an office visit.
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W. Pete Welch (1986) studied this question.
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