One reason I would like Economics to be introduced to O level students despite only starting to study it serious at my Masters is its immense usefulness in daily life (as compared to that abomination English Literature).  One really nifty concept in economics is marginal value, which is contrasted with average value. Marginal value is the value we give to one extra unit of an item. i.e. I'm going to eat lobster rolls with a friend next week and I bet we're both looking forward to it. This is a special event because neither of us eat lobster rolls on a regular basis. If my friend has already eaten three lobster rolls that morning, he probably would not be too excited to each his fourth lobster roll  with me that afternoon.  Ergo, the marginal value of the fourth lobster roll is very small compared to the first.  The crucial...