Answer :
Final answer:
An increase in population and the development of a new potato plant variety can affect the equilibrium quantity and price of potatoes.
Explanation:
Equilibrium quantity and price of potatoes are impacted by an increase in population and the development of a new, higher-yielding variety of potato plant. When the population increases, the demand for potatoes rises, which can lead to a higher equilibrium quantity and price. The introduction of a new, higher-yielding potato plant variety can increase the supply of potatoes, potentially leading to a decrease in the equilibrium price but an uncertain effect on the equilibrium quantity.