Answer:
The demand and supply curve will both shift to the right.
The change in price is ambiguous.
The quantity will increase.
Step-by-step explanation:
As the government provides subsidies to zero-emission vehicles. The cost of production for such vehicles producing firms will decline. This will cause an increase in supply as the firms will be able to produce more at the same cost. This will cause an increase in supply shown by a rightward shift in the supply curve.
As there is a higher priority among households to reduce their environmental impact. They will demand more of these vehicles. This will cause an increase in demand indicated by a rightward shift in the demand curve.
The rightward shifts in both demand and supply curve will cause an increase in the equilibrium quantity of the commodity.
The change in price level depends upon the extent of the increase in demand and supply.