A positive externality for a developing nation, if a U.S. corporation and manufacturing company in a developing nation establish a flair trade agreement is "education levels may rise'.
With the help of fair trade agreement, the level of education can be increased for the students.
Developing nations have many of the things that developed nations have, including a good financial system, a system of taxation, laws that apply equally to all people, basic infrastructure and a significant working population.
Moreover, developing nations are expected to continue growing until they reach the level of developed nations.
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