Which of the following would shift the supply curve of Green Bay Packers football jerseys to the left?

• A. An improvement in jersey manufacturing technology
• B. A decrease in the number of competing sports teams
• C. An increase in the cost of fabric used to make the jerseys
• D. A decrease in the price of Green Bay Packers football jerseys

Answer: (C)

Verified step by step guidance

1. Understand that a supply curve shows the relationship between the price of a good and the quantity supplied by producers, holding other factors constant.
2. Recall that a leftward shift in the supply curve means a decrease in supply at every price, often caused by factors that increase production costs or reduce the ability to supply.
3. Analyze each option: An improvement in manufacturing technology typically lowers production costs, shifting supply to the right (increase in supply).
4. A decrease in the number of competing sports teams affects demand or market competition but does not directly shift the supply curve for jerseys.
5. An increase in the cost of fabric raises production costs, causing producers to supply less at each price, which shifts the supply curve to the left.