A large share of the world supply of diamonds comes from Russia and South Africa. Suppose that the marginal cost of mining diamonds is constant at $2,000 per diamond, and the demand for diamonds is described by the following schedule: Price Quantity
(Dollars) (Diamonds)
8,000 2,000
7,000 3,000
6,000 4,000
5,000 5,000
4,000 6,000
3,000 7,000
2,000 8,000
1,000 9,000

If there were many suppliers of diamonds, the price would be per diamond and the quantity sold would be diamonds. If there were only one supplier of diamonds, the price would be per diamond and the quantity sold would be diamonds. Suppose Russia and South Africa form a cartel. In this case, the price would be per diamond and the total quantity sold would be diamonds. If the countries split the market evenly, South Africa would produce diamonds and earn a profit of .

If South Africa increased its production by 1,000 diamonds while Russia stuck to the cartel agreement, South Africa's profit would to .