The article assumes you hire perfect people and manage them perfectly. If you manage them improperly, or your the people you hire are bad, the numbers certainly

The article assumes you hire perfect people and manage them perfectly. If you manage them improperly, or your the people you hire are bad, the numbers certainly go down. But the point of the article still stands even if you do things perfectly, it's the agency business model that is the limiting factor here, I think.