Final answer:
An increase in the price of Velcro will result in a decrease in equilibrium price but an increase in equilibrium quantity of shoes. Therefore, the correct option is B.
Step-by-step explanation:
An increase in the price of Velcro, which is used as fasteners for kids' shoes, will result in a decrease in equilibrium price but an increase in equilibrium quantity of shoes. This is because the increase in price of a key input like Velcro will lead to higher production costs for shoe manufacturers. As a result, fewer shoe manufacturers will be able to supply shoes at the current equilibrium price, causing a decrease in supply. However, the increase in price will incentivize producers to supply a larger quantity of shoes.