Consider the labor market for workers building boats. For each of the following scenarios draw a graph showing the effect on the labor market for boat builders. How does the equilibrium wage and number of boat builders change? 

a. Boat manufacturers begin using more efficient robots on the assembly line and the substitution effect dominates the scale effect. 

b. There is an increase in the wage of automobile manufacturing workers (assume boat builders and automobile workers have similar skills and can work in both industries). 

c. There is a decrease in unemployment benefits.