I had a lot of 'business management' lessons when I studied economics. Most of them were so full of emptiness that I came to think that most of a business degree is part of faking it, a kind of symbolic ritual. (There were however a minority of useful things like accounting, controlling, tax laws).

If I remember well, I also read in a book about german economic history that business schools were created mainly to allow business people to boast degrees just like medical doctors and engineers.