You're having a good run with John Kenneth Galbraith, Lilith7, I've known that he existed but didn't know just how succinct he was, thanks for the pointers.
It's not the least charm of a theory that it is refutable. The hundred-times-refuted theory of "free will" owes its persistence to this charm alone; some one is always appearing who feels himself strong enough to refute it - Friedrich Nietzsche