It's not that simplistic, it's not a conspiracy it's a self-selecting self-replicating system.
How do economics professors get hired? By impressing other economics professors. And by having the power to win funding for the department. Who are the people that tend to fit those criteria? Mostly, those who already agree with the existing establishment, and those who already have views amenable to the well-resourced bodies that distribute funding.
How do economics professors get hired? By impressing other economics professors. And by having the power to win funding for the department. Who are the people that tend to fit those criteria? Mostly, those who already agree with the existing establishment, and those who already have views amenable to the well-resourced bodies that distribute funding.