If MBAs weren't economically efficient, the market wouldn't make so many of them and companies wouldn't pay them so much.

I refer you to the discussion a few days back on people not being accurately modeled as rational agents: https://news.ycombinator.com/item?id=32181987

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...

This is pure fantasy. Markets have never been efficient and actors have never been rational.

Markets are more efficient and by rational it means they act in their perceived best interest to optimize their own utility.

You just don’t know economics, that doesn’t make it fantasy

I think that was sarcasm. Or at least I hope so.

And you surely got enough answers showing why the "\s" is important...

That's like looking at America and saying obesity and opioid addiction must be drivers of economic success.

MBA schools are just credentials laundering services.