Suppose that the quantity of corn supplied depends on the price of corn(P) and the amount of rainfall (R). The demand for corn depends on the price of corn and the average level of income, Y: The equations describing the supply and demand relationships are
Qs = 20R + 100P
Qd = 4000 - 100P + 10Y
Sketch a graph of demand and supply curves that shows the effect of an increase in rainfall on the equilibrium price and quantity of corn. Do price and quantity increase or decrease?