As the consumers usually pays for a product at the equilibrium price, they are said to gain the surplus of what they haven't paid.
For example, if we look at hats, at an equilibrium price of $10, a producer is able to sell 10 hats and at a price of $15 the producer is able to sell 5 hats. This means that there are 5 consumers willing to pay $15 for a hat, but they purchase them at the equilibrium price of $10 instead, therefore, they have paid less than they were willing to. In the graph, the area labeled green is the consumer surplus.
The producer also gets a surplus, which is the amount of money that the consumer is willing to pay for a certain good, the producer surplus is labeled yellow in the graph
The graph is on the next slide
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