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Start Over You searched for: Degree PHD ✖ Remove constraint Degree: PHD Keyword GDP per capita ✖ Remove constraint Keyword: GDP per capita Keyword Institution ✖ Remove constraint Keyword: Institution Keyword NCLB ✖ Remove constraint Keyword: NCLB Keyword achievement score ✖ Remove constraint Keyword: achievement score Keyword human capital theory ✖ Remove constraint Keyword: human capital theory Keyword private internal rate ✖ Remove constraint Keyword: private internal rate Keyword return of educational investment ✖ Remove constraint Keyword: return of educational investment Keyword supplementary institution ✖ Remove constraint Keyword: supplementary institution Author Last Name Kim ✖ Remove constraint Author Last Name: Kim