Refer to the figure above, which shows three supply curves for corn. Which of the following would cause the supply of corn to shift from S₁ to S₂?

Question

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The development of a more effective insecticide against corn rootworm would decrease the cost of producing corn, leading to an increase in supply and a shift of the supply curve to the right from S₁ to S₂. An increase in the price of fertilizer (choice A) would increase the cost of producing corn, leading to a decrease in supply and a shift of the supply curve to the left. A change in consumer tastes away from cornbread (choice B) and a decrease in consumer incomes, assuming corn is a normal good (choice C), would both decrease demand for corn, not supply.

Refer to the Figure Above, Which Shows Three Supply Curves