People enjoy outdoor holiday lighting displays and would be willing to pay to see these displays but can't be made to pay. because those who put up lights are unable to charge others to view them, they don't put up as many lights as people would like. this is an example of a:

This is a demand side market failure

Explanation:

Demand side market failure occurs when the business owner selling a particular product is not able to make the buyer pay for that particular product even though it may be in demand around that time.

Example are the Christmas decorations even though they are in demand around Christmas but the fact that they are decorating all over the most places, one can not charge people from looking and enjoying these decorations because they are usual all over the place .

Another example is also fireworks which are fired around Christmas everyone can enjoy them without having paid for them.

no because it could make the world a terrible place to live in.

i believe your answer is mountains.