Consumer Surplus 

Consumer surplus is the amount that buyers are willing to pay less than the amount actually paid, measures the benefit that buyers receive from a good in terms in which they perceive. For example , if John wants a product and that product is willing to pay 100. And when you get to the store is that the product is now on sale and costs 80. Then it is said that John has a consumer surplus of 20. Keep up reading to know more about consumer and producer surplus.