Arrow's impossibility theorem The task of designing a national health system is at its heart an optimization problem,not dissimilar to the task of an individual in the Grossman model. Societies must decide how much time and money they want to spend on improving their health,and how much time and money they want to spend on other national priorities-like education and the military. Then they must chart a strategy for achieving the level of health they want,both cheaply and efficiently. Bhattacharya,Hyde and Tu-HealthEconomics Bhattacharya, Hyde and Tu – Health Economics Arrow’s impossibility theorem  The task of designing a national health system is at its heart an optimization problem, not dissimilar to the task of an individual in the Grossman model. • Societies must decide how much time and money they want to spend on improving their health, and how much time and money they want to spend on other national priorities – like education and the military. • Then they must chart a strategy for achieving the level of health they want, both cheaply and efficiently