Question

How we measure the consumer and producer surplus?​

Answer 1

Measuring Producer Surplus :

Subtracting the producer's total cost (the triangle under the supply curve) from his total revenue (the rectangle) shows the producer's total benefit (or producer surplus) as the area of the triangle between P(i) and the supply curve. Total revenue - total cost = producer surplus.

Measuring Consumer Surplus :

Consumer surplus is measured as the area below the downward-sloping demand curve, or the amount a consumer is willing to spend for given quantities of a good, and above the actual market price of the good, depicted with a horizontal line drawn between the y-axis and demand curve.