Answer
Change in equilibrium quantity = -1000
Change in equilibrium price = 1 dollar
Work Step by Step
Equilibrium quantity and price of D1/S1,
Quantity: 7000
Price: 2 dollars
Equilibrium quantity and price of D1/S2,
Quantity: 8000
Price: 1 dollars
Change in equilibrium quantity = 7000-8000 = -1000
Change in equilibrium price = 2 dollar - 1 dollar = 1 dollar