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.

answer; /// i do believe the correct answer is ( a

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.