Which of the following is NOT an identity?

Net worth equals assets minus liabilities.
The amount bought equals the amount sold.
The amount of a product that people will buy depends on the price of the product.
Profit is the difference between revenues and costs.

In a zero-sum game whatever someone earns is exactly matched by something that someone else losses. There are also positive-sum and negative-sum situations. In a positive-sum situation, the amount won exceeds the amount lost. In a negative-sum situation, the amount lost exceeds any winnings. An example of a negative-sum game is:

free trade.

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