Answer: Firm D

## Explanation This question is about identifying which counterparty would provide the greatest combined benefit in an interest rate swap arrangement. The scenario involves: - An oil driller who would normally issue floating rate debt - A counterparty that would normally finance with fixed rate debt - A swap that allows both parties to achieve their desired financing structure The greatest combined benefit occurs when there is the largest difference in comparative advantage between the two parties. In swap arrangements, the firm that has the greatest comparative advantage in one type of financing (fixed vs. floating) will provide the most benefit when swapping with a firm that has a comparative disadvantage in that same type of financing. Since the question doesn't provide specific borrowing rates for each firm, we would typically look for: - The firm with the largest spread between its fixed and floating rate borrowing costs - The firm that has the most significant comparative advantage in fixed rate financing compared to the oil driller **Firm D** is identified as the correct answer because it likely represents the counterparty with the greatest comparative advantage in fixed rate financing, which would create the largest combined benefit when swapping with the oil driller who has a comparative advantage in floating rate financing. The swap benefit is calculated as the difference between the two parties' comparative advantages, so when one party has a much larger advantage in one market and the other party has a much larger advantage in the other market, the total benefit from the swap is maximized.

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