One thing that can lead to a positive externality on the international scene is Foreign aid.
How can foreign aid lead to a positive externality?
A positive externality refers to when an action between parties leads to a good effect on other parties that were not part of the original transaction.
When foreign aid is given to other nations, those nations can invest the aid in their citizens which means that the citizens would then get a good effect thereby making the aid a positive externality.
In conclusion, a positive externality results from foreign aid.
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