Answer:
An increase in demand
Explanation:
The graph illustrates a shift in demand curves to the right. As a result, the equilibrium price and quantity have increased.
A demand curve will shift to the right due to an increase in demand caused by non-price factors. An increase in demand means that the quantity demanded increases at all the price levels. Factors that may cause an increase in demand include a change in consumer preferences and tastes, an increase in the price of substitute goods, or a rise in demand for a complement product.
