Which type of government has the highest gdp?

The form of government that has the highest form of government is the federal republic.

Explanation:

Federal republic is a federation of various states with the government that is elected by the people of that country and the country is governed by these elected representatives.

And it is not run by a queen or a king. In such a form of government, there is also a division of power between the central level and the regional level.

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