If many people in a community get flu shots, the whole community benefits, including those who did not get flu shots. Therefore, not enough people may decide to get the shots. This is one illustration of .

Demand side market failure:

Explanation:Demand side market failure occurs when the business fails to charge the consumer for a particular product or service .

For example fire works can be enjoyed by everyone , even those who didn't buy them because it is impossible to do so.

i do believe that the correct answer is   (technical reasoning); luck

explanation:

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!