CVS reports earnings Wednesday. Here's what to expect

CVS has had to weather some rocky stock moves since closing on its merger with health insurer Aetna Inc., but things could be looking up soon. Shares of the drugstore chain have fallen 15% so far this year amid narrowing pharmacy margins; investor concern over the future of health policy; increased scrutiny into the pharmacy-benefit manager model (CVS owns its own PBM, CVS Caremark); and investor skepticism over the company’s $70-million Aetna acquisition.