Two men are flying in a captive balloon. The wind is ugly and they come away from their course and they have no idea where they are.

So they go down to 15 m above ground and ask a passing wanderer. 'Could you tell us where we are?'

'You are in a balloon.'

So the one pilot to the other:

'The answer is perfectly right and absolutely useless. The man must be an economist'

'Then you must be businessmen', answers the man.

'That's right! How did you know?'

'You have such a good view from where you are and yet you don't know where you are!'