If a consumer experiences an increase in consumer surplus when they purchase a product, what is the underlying cause of this change?

Consumer surplus is the benefit that consumers get when they pay less for a product than what they are willing to pay. When a consumer experiences an increase in consumer surplus, it usually happens because the price of the product has decreased or because they perceive the value of the product to be higher than the price they pay. For example, if someone is willing to pay $50 for a pair of shoes but finds them on sale for $30, their consumer surplus increases to $20. This change means they feel happier with their purchase because they saved money and got more value than expected. Overall, the increase in consumer surplus reflects a better deal for the consumer, making them feel satisfied with their purchase.