Final answer:
Imperfect information leads buyers to use price as an indicator of quality, making it hard for buyers and sellers to agree on a price and challenging to reach market equilibrium.
Step-by-step explanation:
It might be difficult for a buyer and seller to agree on a price when imperfect information exists because the perceived value of a product can be significantly influenced by its listed market price. In cases where a car dealer lowers prices to move inventory, buyers might infer that the cars are of low quality and steer away, thus not helping in increasing sales. Conversely, higher prices can lead to the assumption of higher quality and potentially boost sales. This phenomenon occurs because, in markets with imperfect information, price becomes a heuristic for quality, making it challenging to achieve equilibrium price and quantity.