Answer:
Decrease in price of some other input of shoes, leading to reduction in shoes price.
Step-by-step explanation:
Increase in cost of production of shoes due to high setup decreases the supply, or shifts the supply curve leftwards. Analogous to - Increase in price leading to contraction in demand.
This increased cost, higher price problem can be solved by trying to reduce the cost of production & subsequently the price of shoes. It can be done by using other inputs of lower cost. So that supply curve increases to previous level & equilibrium is restored.