Easy answer.
Look at the rates his advertisers are willing to pay.
Unlike talentless journalists and politicians, businessmen rely on facts, and will DEMAND accurate audience measures before they fork over advertising dollars.
Exactly. Radio ad rates are based on arbitron ratings. They do surveys of radio listenens just as the Nielsen ratings measure TV ratings. If they didn’t have this evidence of audience size his stations wouldn’t get the ad revenues they get when his show is on.
And he himself wouldn’t have a multi million dollar contract to do his show.
Why are the liberals even bringing up differing estimates of his audience size? Even the lowest estimated number is geometrically larger than the audiences for Air America before they went under. What is their point?