Answer
Please see the graphs.
Work Step by Step
a) The supply of cotton decreases, shifting the supply curve to the left.
b) Compared to leather jackets, sweatshirts are an inferior good. Since the price of leather jackets decreased, demand for sweatshirts also decreased. The demand curve shifted to the left.
c) Demand for sweatshirts increased, shifting the curve to the right.
d) Technology decreased the labor needed for each sweatshirt, so supply increased (and shifts the supply curve to the right).
