If a physicist was invited to consider what he would do if he was alone on a desert island with cans and no tin-opener, he'd say he would lay out loads of leaves on the ground, and so angle the tins that they would soon explode and the leaves catch the beans.

   if a philosopher was in the same position, he would say that he would see if he could prove that the cans were really there.

   An economist would begin thus,

"Assuming I had a tin-opener........................."






       Ivor