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 develops and estimates a dynamic model of consumer demand for deposits in which banks provide differentiated products and product characteristics that evolve over time. Existing consumers are forward-looking and incur a fixed cost for switching banks, whereas incoming consumers are...

This paper develops and estimates a dynamic model of consumer demand for deposits in which banks provide differentiated products and product characteristics that evolve over time. Existing consumers are forward-looking and incur a fixed cost for switching banks, whereas incoming consumers are...

We study the effects of dispersion of investors' beliefs and dispersion of belief changes on stock trading volume. Unlike most of the existing work on the subject, our paper focuses on how investors' disagreements on macroeconomic variables affect marketwide trading volume. These macro variables...