"Under the assumption of no unmeasured confounders, a large literature exists on methods that can be used to estimating average treatment effects (ATE) from observational data and that spans regression models, propensity score adjustments using stratification, weighting or regression and even...

In health markets, government policies tend to subsidize poorer groups. The purpose of this paper is to analyze the implications of an income-based subsidy policy on the incentives of countries to implement price arbitrage and of firms to provide market access to poorer groups. --...