From a demand curve,consumer surplus is the area:

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Consumer surplus is the difference between what a consumer is willing to pay for a good or service and what they actually pay. It is represented by the area below the demand curve and above the market price. This is because the demand curve represents the highest price a consumer is willing to pay for each quantity purchased, and the market price is the actual price they pay. The area above the market price and below the demand curve shows the amount of additional benefit or surplus the consumer receives from purchasing the good at a lower price than they were willing to pay.

From a Demand Curve,consumer Surplus Is the Area