"Once a merger is approved, nobody studies whether the consultants’ predictions were on the mark. The Department of Justice and the Federal Trade Commission do

"Once a merger is approved, nobody studies whether the consultants’ predictions were on the mark. The Department of Justice and the Federal Trade Commission do not make available the reports that justify mergers, and those documents cannot be obtained through public records requests. Sometimes the companies file the expert reports with the courts, but judges usually agree to companies’ requests to seal the documents. After a merger is cleared, the government no longer has access to the companies’ proprietary data on their pricing."