[arahant]

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There are clearly negative externalities....if YOU get sick, I am more likely to get sick. And if you want to make the 'voluntarily allow' argument, then the negative externality is that there are now fewer girls I can [censored].

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cervical cancer is not contagious. either you didn't read my posts or you don't have a basic understanding of market failure and externalities. based on your last sentence, i would say the latter is true at the very least.

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Come on...now you are just objecting to the facts in order to make your point.

First - cervical cancer is effectively contagious to the extent it is viral in origin. There is no rationale for distinguishing between the cancer itself and the virus in this case.

Second - A negative externality is a cost incurred by someone outside the transaction. The transaction in this case is a vaccination. The refusal of a girl to be vaccinated increases the prevalence of a disease. The increased prevalence of the disease increases my odds of contracting it. I know you understand this. You don't really think that vaccinations don't have any value beyond the recipient, do you?

If you still need help, google "vaccine externality".