If MBAs weren't economically efficient, the market wouldn't make so many of them and companies wouldn't pay them so much.
Companies and entire markets follow similar patterns of only having bounded rationality, IMHO. Markets can also have decades of slack or delay from stimulus to outcomes. Take the slow decline of Boeing after acquiring McDonnell Douglas and their MBA heavy structure. https://qz.com/1776080/how-the-mcdonnell-douglas-boeing-merg...
You just don’t know economics, that doesn’t make it fantasy