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1.4. The aggregate supply curve for a country A. cannot be affected by the government, as it is set by firms. . will shift to the left if the price level decreases, as firms will receive less money for their goods. C. will shift to the left if input costs increase. D. is horizontal throughout all output ranges in a perfectly competitive market. E. is vertical throughout all output ranges in a perfectly competitive market. If the rand is depreciating, the South African Reserve Bank could, if it so wishes, assist to strengthen the value of the rand by A. reducing the South African interest rate. B. buying foreign currency in exchange for rand on the foreign exchange market. C. selling rand in exchange for foreign currency on the foreign exchange market. D. selling gold reserves to aid the value of the rand E. selling foreign currency in exchange for rand on the foreign exchange market