The focus of antitrust on prices is the direct result of Bork's influence on the Supreme Court, as this excellent article makes clear [1]:
>And so Bork argued that federal judges must resolve the “paradox” by declaring that the only legitimate purpose of antitrust law was to promote “consumer welfare,” basically meaning lower prices. And the only way to promote consumer welfare was to promote efficiency, because efficiency meant more production, which meant cheaper products. Any other purpose would interfere with efficiency and must therefore be ignored.
>To see how radical this was, just consider one example of something not captured by consumer welfare: employee welfare. In a town dominated by a single employer, workers may be forced to submit to poverty wages and abusive work conditions. Coal miners know this all too well—so do Walmart employees. (See Alec MacGillis, “What J. D. Vance Doesn’t Get About Appalachia.”) But to Bork, that could never justify antitrust enforcement so long as the product stayed cheap.
>The Antitrust Paradox makes for remarkable reading today. Like a caricature of a Chicago School economist, Bork explicitly warned against learning from experience. Rather, all business practices should be judged based on what “simple” (his word) economic models predict. “Only theory can separate the competitive from the anticompetitive,” he wrote. And theory says consolidation is good, because it means strong firms are crushing weak ones.
[1] https://washingtonmonthly.com/magazine/novemberdecember-2017...