The best republic suggested Plato is one in which philosophers are in charge. Olly philosophers have been trained and disciplined to govern with the best interests of the republic in mind other forms of government necessary create an us-versus-them'dichhotomy that is ultimately unsustainable
Answer: Positive externality
Explanation: Positive externality is the concept in which the service produced and the consumption of that service will provide benefit a third party who is not a part of the process.
While producing fertilizer , it is providing a unintentional benefit to the community surrounding(third party) by keeping the insects away through exerting gases so that they don't cause insect bites or other problem.
Other options are incorrect because negative externalities are negative consequences face by the third party in a process. Comparative externality is related with comparison and pecuniary externality is increment or decrement in market price of service by action of economic actor .
