Question: A spring runs under a village. Everyone can sink a well on her or his land and take water from the spring. The following figure shows the marginal social benefit from water and the marginal cost of taking it.
![909_12.png](https://secure.tutorsglobe.com/CMSImages/909_12.png)
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?