Brazil's 'pay what you weigh' restaurants.

For many people living in one of the world's richest cities eating out has become a regular feature of life - but, as in other parts of the world, choosing just what to eat can be a problem.
In recent years, a new kind of eating experience has thrived in the Brazilian city of Sao Paulo - the self-service or "kilo" restaurant.
Customers pick as much as they want from a wide range of dishes then weigh their plates to find out much they have to pay.
The kilo concept has proved so popular that gourmet restaurants are beginning to adopt the idea.
From BBC News Close-oup