Physician ownership of ancillary services: Indirect demand inducement or quality assurance?
分析医生拥有辅助设施（如理疗）的两种解释：间接需求诱导和质量保证。研究发现医生自营诊所比独立诊所多治疗50%的患者，但质量无差异，支持需求诱导假说。
This paper analyzes two competing explanations for the ownership of ancillary facilities by referring physicians: indirect demand inducement and quality assurance. Consistent with the demand-inducement explanation we find physician-owned clinics treat patients for 50 percent more visits than do independent clinics and the differential is directly related to factors facilitating demand inducement. We find no difference in quality of care across ownership structures, however. In further support of the demand-inducement hypothesis we find that physical therapists are less likely to work in physician-owned clinics in states where therapists are allowed to practice independently.