Which of the following situations would lead to an increase in the equilibrium price of carrots and a decrease in the equilibrium quantity of carrots sold?

• A. An increase in the price of hummus, a complement to carrots
• B. An increase in the price of celery, a substitute for carrots
• C. An increase in the price of fertilizer, an input for carrots
• D. An increase in consumers' incomes, assuming carrots are a normal good

Answer: (C)

Verified step by step guidance

1. Identify the factors affecting the supply and demand of carrots. In this problem, we are considering the price of fertilizer (an input), the price of hummus (a complement), the price of celery (a substitute), and consumer incomes (assuming carrots are a normal good).
2. Understand how each factor affects the supply or demand curve. An increase in the price of fertilizer would increase production costs, shifting the supply curve for carrots to the left. An increase in the price of hummus would decrease the demand for carrots, shifting the demand curve to the left. An increase in the price of celery would increase the demand for carrots, shifting the demand curve to the right. An increase in consumer incomes would increase the demand for carrots if they are a normal good, shifting the demand curve to the right.
3. Analyze the effect of each scenario on equilibrium price and quantity. A leftward shift in the supply curve (due to increased fertilizer prices) would lead to a higher equilibrium price and a lower equilibrium quantity of carrots.
4. Consider the other scenarios: A leftward shift in the demand curve (due to increased hummus prices) would decrease both equilibrium price and quantity. A rightward shift in the demand curve (due to increased celery prices or consumer incomes) would increase both equilibrium price and quantity.
5. Conclude that the scenario where the price of fertilizer increases is the only one that results in an increase in equilibrium price and a decrease in equilibrium quantity, as it causes a leftward shift in the supply curve.