The construction of a brick wall has a negative externality because it limits the residents' access to the lake view.
A negative externality occurs when a third party pays costs as a result of the production or consumption of a good. Pollution of the air and noise are common examples of negative externalities.
The property's main benefit, given its location on the lakeside, is getting a clear view of the lake. It provides a premium over the property's value. When a brick wall is built to block the lake view, the premium value will be lost. People also have a unique mood due to the lake view. Once they are confined by the brick wall, they begin to feel uncomfortable. They consequently dismantle the brick wall.
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