Which of the following scenarios involves an externality? If an externality exists, describe the externality and whether it is positive or negative. If there is no externality, explain why. For each scenario with an externality, describe one potential solution that could lead to better outcomes. a) Getting a flu shot [2.5 points] b) A rise in the price of flu shots [2.5 points] c) Going to a party when you have the flu [2.5 points] d) A recently published study found that Zinc, a dietary supplement, can help prevent the flu. Prior to the study, the health effects of Zinc were not known. Now, more people are buying Zinc, and the price for everyone--including those who always bought Zinc--has increased. [2.5 points]