21 If the village council sets a quota on the total amount of water such that the spring is used efficiently, what would be the quota and the market value of the water taken per day?

A spring runs under a village. Everyone can sink a well on their own land and take water from the spring. The following figure shows the marginal social benefit from and the marginal cost of taking water.

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Price and cost (cents per litre) 50 50 40 30 30 20 20 10 MSC MC MSB 600 800 Quantity (litres per day) 0 200 400