All of the class except five people imagine yourselves as poor people in a village. You have a little grain, some eggs and perhaps a chicken or two that you can afford to sell.

Everyone else has the same things to sell. So it's no good selling to other poor people what they already have.

Five people try setting up stalls in a market square. What could you offer poor people that they need and can afford? How would you go about selling it to them and what would you do if they did not have any money?

Everyone in the class try selling and buying.