Easy to do the diagnosis after the patient has died: Arise instant experts. Theresa May, the British Prime Minister, for example. First they said it was a brilliant stroke to call a snap election when her Labour Opposition party - and in particular its leader, Jeremy Corbyn - stood at least 24 points behind in the polls.
Come election time the pundits were proved wrong - again. Corbyn closed the gap; May's conservatives have to form an alliance with a fringe party to govern. Immediately, commentators said May's call was a disaster. Her parliamentary colleagues went from loving her, to two thirds wanting rid of her. Politics, politicians and pundits will never be your friends.
Hedge fund stars are that until they become just ordinary investors, like the people whose money they take for a 2 per cent management fee and 20 per cent of profits but suffer no personal loss unless they've invested their "own" money in the fund they manage. And it isn't really their money as the top 25 fund managers charged - not earned - over US$1billion each last year.
You read right: I said the B-word. "But, hey, we're expert investors even when we aren't. And the rest of you are fools." Bankers' economic analysis comes out with all the right terms. Just wrong predictions. Crystal-ballers they are not.
Economists are just sociologists using numbers and, unlike the former, predict an event rather than describe it after it has happened. And when they get that wrong they go silent for a while and let other economists tell us, "I told you so".