An increase in which of the following would shift the supply curve for gasoline to the right?

Question

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An increase in the number of producers of gasoline would increase the amount of gasoline available in the market and thus shift the supply curve for gasoline to the right. This would mean that at each price level, there would be more gasoline available, increasing the quantity supplied. The other choices (A, B, and D) all relate to demand or input prices and would not directly affect the supply of gasoline.

An Increase in Which of the Following Would Shift the Supply