What can happen with the CVS-Aetna merger

A pedestrian walks by a CVS store.
CVS Health bought Aetna in a deal worth $78 billion. Photo: Justin Sullivan/Getty Images

Federal judge Richard Leon is raising antitrust concerns about CVS Health's $78 billion takeover of Aetna, but legal experts say he simply doesn't have authority to nix the deal.

Why it matters: The biggest companies in health care keep getting bigger, and critics fear anticompetitive effects — but nothing has actually slowed the industry's rapid consolidation.

Who pays for proposed Medicare reform

Senate Finance Committee Chairman Chuck Grassley said last week that he is interested in restructuring Medicare's prescription drug benefit, including putting drug manufacturers on the hook for some of the costs accrued in the "catastrophic phase" of coverage.

By the numbers: A new analysis by the American Action Forum shows the winners and losers. Cheaper drugs would win, and more expensive drugs would end up paying more than they do now.