This paper presents the results of two natural field experiments at a dental clinic. Guided by simple theoretical model, we exogenously vary deadlines and associated rewards for arranging checkup appointments. Our data show strong systematic effects on patients’ behavior. Imposing induces patients to act earlier persistently higher frequency than without deadline. We further document that indiv...

abstract in this study, evaluation of swap model in simulating crop yield, water and salt movement in soil were investigated in the wheat- fodder maize cultivated units. the research was conducted in the voshmgir network, golestan province. the crop yield, soil humidity and moisture data in different times of agriculture year of 2007-2008 were measured. the measured and simulated data were anal...