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4. Oligopolies and Cartels 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 $3,000 per diamond, and the demand for diamonds is described by the following schedule: Price Quantity ( Dollars) (Diamonds) 8,000 3,000 7,000 4,000 6,000 5,000 5,000 6,000 4,000 7,000 3,000 8,000 2,000 9,000 1,000 10,000 If there were many suppliers of diamonds, the price would be S per diamond and the quantity sold would be diamonds. If there were only one supplier of diamonds, the price would be |$ 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 S 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? O One party has an incentive to cheat to make more profit. O Different firms experience different costs. O All parties would make more money if everyone increased production