To derive the market demand for public goods, individual demand must be

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To derive the market demand for public goods, individual demand curves are added vertically. This is because public goods are non-excludable and non-rivalrous, meaning that one person's consumption does not reduce the availability for others, and everyone can consume the good simultaneously. Therefore, the total willingness to pay, or the market demand, is found by summing up the individual valuations (demands) at each price level, which is done vertically.

To Derive the Market Demand for Public Goods, Individual Demand