Due to the sudden outbreak of the pandemic, you were asked to stay back in your home to maintain social distancing. If you do not follow the restriction, there is a possibility that you infect another 2.5 people, and on average, the government must incur $40 each person on their medical expenses. You realize that your marginal cost of staying back home is MC= 10 + 5 Q, where Q is the number of weeks you confine yourself in your home. Moreover, you enjoy a benefit of $40 each week for not traveling to your work. How many days will you stay back home at optimum (consider yourself a selfish person)? What is the socially efficient number of weeks you should stay back home? What fine should the government impose if you do not follow the rule?
PMC = 10 + 5Q
PMB = 40
Being a selfish person I will stay at home till PMB > PMC, and as PMB = PMC I will go out.
PMC = PMB
10 + 5Q = 40
Q = 6
Being a selfish person I will stay for 6 weeks at home.
But if I stay at home SMB = PMB + Benefit of 40$ which government don't have to spend on me as I am at home
SMB = 40 + 40 = 80
SMC = PMC at, if I am at home it's only costing me and no other entity.
Doing SMB = SMC
80 = 10 + 5Q
Q = 14
I should stay in for 14 weeks in home if I am not selfish.
If I come out government should fine me the amount which society suffers because of me coming out = 40$
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