Confronta i metodi

	Quality-Adjusted Life Year (QALY)	Disponibilità a Pagare (DAP) in Economia Sanitaria
Campo	Economia sanitaria	Economia sanitaria
Famiglia	Process / pipeline	Process / pipeline
Anno di origine	1985	1980s
Ideatore	Alan Williams (Health Economics Research Centre, Oxford University)	Carson & Louviere (stated preference/contingent valuation methods)
Tipo	Method	Method
Fonte seminale	Kind, P. (1989). The EuroQol instrument: an index of health-related quality of life. In B. Teeling Smith (Ed.), Measuring health: a practical approach. Chichester: Wiley.	Carson, R. T., & Louviere, J. J. (2011). A Common Nomenclature for Stated Choice Studies. In S. Hess & A. Daly (Eds.), Choice Modelling: The State of the Art and the State of Practice. Cheltenham: Edward Elgar.
Alias	QALY, health utility measure	WTP, contingent valuation, stated preference method
Correlati	5	5
Sintesi	A QALY measures health benefit as utility weight (0 = death, 1 = perfect health) multiplied by time lived. Developed by Alan Williams in 1985, QALYs enable comparison of disparate health interventions on a common metric. Used globally by health technology assessment bodies—NICE (UK), HAS (France), CADTH (Canada), WHO—to decide which treatments deserve public funding.	Willingness to pay (WTP) is an economic valuation method that elicits what individuals or society are willing to spend for a health benefit or to avoid a health risk. Rooted in contingent valuation (Carson & Louviere, 1980s), WTP is used to monetize health outcomes for cost-benefit analysis and to infer implicit cost-effectiveness thresholds from actual healthcare spending patterns. Unlike revealed preference (observing actual spending behavior), WTP uses stated preferences—surveys asking respondents: 'How much would you pay for this health improvement?'