Why might there be a relationship between income distribution inequality and a country’s development?

Explanation:

High levels of inequality reduce growth in relatively poor countries but encourage growth in richer countries. High levels of inequality reduce growth in relatively poor countries but encourage growth in richer countries, according to a recent paper by NBER Research Associate Robert Barro.

the answer should be

the simple past tense of strive.

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answer; /// i do believe the correct answer is (c) public education;