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 $3,000 per diamond, and the demand for diamonds is described by the following schedule: Price Quantity (Dollars) (Diamonds) 8,0003,000 7,0004,000 6,0005,000 5,0006,000 4,0007,000 3,0008,000 2,0009,000 1,00010,000 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 $ . Why are cartel agreements often not successful