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van Houtven, C.H., and Edward Norton. 2008. "Informal care and Medicare expenditures: Testing for heterogeneous treatment effects." Journal of Health Economics, 27:134-156.
We estimate the effect of informal care on Medicare expenditures not only for care provided by children but also by the source of informal care (sons versus daughters, children versus others) and recipient characteristics (marital status). Our conceptual framework predicts heterogeneous effectiveness by source and recipient of informal care. We estimate two-part expenditure models as a function of informal care, controlling for endogeneity. We find that informal care by children reduces Medicare long-term care and inpatient expenditures of single elderly. We find that children are less effective caregivers among recipients who are married. For single elderly, child caregivers are more effective than other types. Gender of a child caregiver does not matter. (c) 2007 Elsevier B.V. All rights reserved.