Modern antitrust has been dominated since the 1980s by the "consumer welfare standard": mergers and conduct are anticompetitive only if they raise prices or reduce output. Under this framework, enforcement has been relatively narrow.
The "neo-Brandeisian" or "new antitrust" movement (Lina Khan, Tim Wu, others) argues this standard is too narrow — that concentration harms innovation, labor markets, supply-chain resilience, and political power even when consumer prices fall.
Major recent cases include FTC and DOJ actions against Google, Meta, Apple, Amazon, and Live Nation. Bipartisan congressional bills (American Innovation and Choice Online Act, Open App Markets Act) have advanced but not passed.