Final answer:
Price discrimination occurs when a firm charges a lower price to consumers whose demand is more elastic, as they are more sensitive to price changes. So the correct answer is option c.
Step-by-step explanation:
A firm engages in price discrimination when it charges different prices to different consumers based on their willingness to pay, often related to the elasticity of their demand. The correct answer to the student's question on what constitutes price discrimination is option c, which states that a firm carries out price discrimination when it charges 'a lower price to consumers whose demand is more elastic.
' This is because consumers with more elastic demand are more sensitive to price changes, and would buy significantly less or none of the product if the price were higher. On the contrary, a firm charges 'a higher price to consumers whose demand is less elastic' as these consumers are less sensitive to price changes and are more likely to continue purchasing the product even at higher prices.
A firm carries out price discrimination when it charges a lower price to consumers whose demand is more elastic. A monopolistic competitor faces a downward-sloping demand curve which makes the demand curve more elastic compared to a monopoly. When a monopolistic competitor raises its price, it will lose more customers than a monopoly that raised its prices.