Cubic function 

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reassessing relationship between inequality and development pdf
... levels, the kuznets hypothesis is somehow modified. the quadratic function is no longer valid, but instead, a cubic function is highly significant and robust in all our empirical specifications. ... capita levels, the kuznets hypothesis is somehow modified. the quadratic function is no longer valid, but instead, a cubic function is highly significant. these empirical results confirm the existence of ...
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paper-flex-fitzenberger_0.pdf
... transitory phenomena. for a fixed year t, the function f(t, ) yields the conventional cross-sectional wage profiles. movements of f as a function of t describe how cross-sectional wage profiles ... the estimated cohort effects for the different groups in both economies. these are quadratic and cubic terms for cohorts that enter the labor market before and after 1979, orthogonalized to the ...
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