Using the graph, the closing gap between MB _private and MB _social as years of health care increases private implies that 

a. The negative externality associated with healthcare must grow as more health care is obtained. 

b. The negative externality associated with health care must shrink as more health care is obtained. 

c. The positive externality associated with health care must grow as more health care is obtained. 

d. The positive externality associated with health care must shrink as more health care is obtained.

e. There must be an error in the graph.

Transcribed Image Text:

40 35 0 25 20 5 30 25 15 10 MB Positive Externality **** MC MBocial 5 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Quantity (number of vaccinations per lifetime)