Amyn and Sophia were discussing the difference between the price of a product and its worth.
Sophia mentioned she had bought a new dress in a charity shop, but thought it was worth a lot
more than she had paid. Amyn said that the price Sophia had paid was the result of market forces.
He explained the effects of competition between charity shops on the prices of their products.
Sophia produced a table showing the demand by her friends for dresses from charity shops.