Is Drug Coverage a Free Lunch? Cross-Price Elasticities and the Design of Prescription Drug Benefits
51 Pages Posted: 22 Dec 2006 Last revised: 12 Nov 2022
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Is Drug Coverage a Free Lunch? Cross-Price Elasticities and the Design of Prescription Drug Benefits
Date Written: December 2006
Abstract
Recently, many U.S. employers have adopted less generous prescription drug benefits. In addition, the U.S. began to offer prescription drug insurance to approximately 42 million Medicare beneficiaries in 2006. We use data on individual health insurance claims and benefit data from 1997-2003 to study the effects of changing consumers' co-payments for prescription drugs on the quantity demanded and expenditure on prescription drugs, inpatient care and outpatient care. We allow for effects both in the year of the co-payment change and in the year following the change. Our results show that increases in prescription drug prices reduce both the use of and spending on prescription drugs. However, consumers substitute the use of outpatient care and inpatient care for prescription drug use, and about 35% of the expenditure reductions on prescription drugs are offset by the increases in other spending.
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