I like jokes about different trades and professions.  Here is an old one about economists and their models that I came across the other day:  An engineer, a physicist and an economist find themselves ship-wrecked on a desert island, with only a sealed can of baked beans to eat.  How to open the can?  The engineer proposes piercing the can with a sharp flint, whilst the physicist suggests leaving the can out in the mid-day the sun until it explodes.  Meanwhile, the economist thinks for a long while and then says “Firstly, let’s assume that we have a can opener…”

Next time – one on engineers.