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allocation analysis biased Bureau of Economic changes choice variable coefficients commodity demand complementarity composite commodity consumption correlation cross-section estimates demand equation demand for sleep demand system Dependent Variable diaries differences in sleep dummy variable Economic Research economic variables effect on waking elasticity endowment entire sample estimates in Table evidence Fischer Black Hamermesh health status impact implied included income effects increase individual's individuals instrumental variables Journal of Political Kleitman labor market labor supply equations logarithm main sleep marital status mean sleep durations Meddis Michigan State University minutes per day miscellaneous personal National Bureau NBER negative nonlabor income panel data PARAMETER ESTIMATES Paul Krugman percent regression relationship between sleep reported Respondents Robert Sleep and Naps sleep behavior sleep less Sleep Sleep spent sleeping standard deviation standard errors Stiglitz substitution effect suggests Szalai term variations wage effect wage equation wage rate waking leisure Wijnbergen William Schwert workdays