The document discusses several changes occurring in the post-Affordable Care Act healthcare landscape. It describes the rise of Accountable Care Organizations which integrate hospitals and physicians to coordinate patient care. It also notes the trend of hospitals acquiring physician practices, making hospitals the dominant player. Health systems are merging into larger organizations and acquiring ancillary services like rehabilitation facilities. The document outlines the establishment of health insurance exchanges and details the availability of premium subsidies and cost-sharing reductions for lower-income individuals. It provides data on enrollment in exchanges and Medicaid expansion.