1. The demand for rental units is Q = 2,000 - p + Y/10, where p is the rental price and Y is median income. The supply of rental units is Q = p - Y/40.
   1. What are the equilibrium price (p^*) and quantity (Q^*) in terms of Y.
   2. Does equilibrium price p^* have a positive or negative relationship with Y, show with calculus.
   3. Does equilibrium quantity Q^* have a positive or negative relationship with Y, show with calculus.
   4. Based on your answer to parts b andc, does supply or demand shift by more when income changes?