不是求英文解释 而是我想知道几道题的答案 举例子啊 按照题的要求

不是求英文解释 而是我想知道几道题的答案 举例子啊 按照题的要求
1.Tell an example of an externality (from “real life” around you).Explain how it is an externality.Is
it positive or negative?How could it be possibly corrected?– if you can suggest more than one
way to correct it,what are the advantages/disadvantages/difficulties of each of those ways?If
the externality in your example is being corrected,tell how and why.If it is not being corrected,
tell why.
2.Give 3 examples of Free Riding (from “real life” around you).For each of your examples,explain
why it is allowed to exist (i.e.,why doesn’t one introduce punishment great enough and
enforces it sufficiently to prevent free riding).