This paper studies the contribution of demand, costs, and strategic factors to the adoption of hub-and-spoke networks in the US airline industry. Our results are based on the estimation of a dynamic oligopoly game of network competition using data from the Airline Origin and Destination Survey...

We examine whether loss of emergency department services is associated with county-level mortality rates in rural areas over the period 2005-2018. We use a propensity-weighted difference-in-difference approach, comparing counties that lost emergency department services to counties that retained...

Since the inception of Medicare Part D in 2006, mergers and acquisitions (M&A) and regulatory changes have led to increased concentration and reduced plan variety in the standalone prescription drug plan (PDP) portion of the market. We examine how this industry consolidation affects Medicare...

This paper examines whether loss of locally available hospital-based obstetric services affects racial/ethnic disparities in intrapartum care access and birth outcomes in rural areas of the US. To conduct causal inference, we combine difference-in-difference and propensity score matching methods...