One way to measure the gain to society from a drug that has the potential to reduce obesity is to measure what people are willing to pay for the good and subtract the amount they have to pay.

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This method of measuring the gain to society is known as consumer surplus, which is calculated by subtracting the price consumers are willing to pay for a good from the actual price they have to pay. It indicates the net benefit to consumers from consuming the good and can be used to estimate the social welfare gain of a new product or technology.

One Way to Measure the Gain to Society from a Drug