Question

when demand increase and supply decrease in same ratio

Answer 1

IV) Demand increases and Supply decreases ... and supply decrease in the same proportion, equilibrium price remains

Answer 2

If supply rises more than demand, we get a decrease in price. If they rise the same amount, the price stays the same. In general, then, we can say that when supply and demand rise simultaneously, we get an increase in equilibrium quantity and an unknown change in price