Causality I would seek: https://www.academia.edu/13062623/Informal_Proof_of_Thomas_Pikettys_Thesis-2014060802 … https://www.academia.edu/12823875/An_idea_set_forth_in_1992_and_written_up_in_1993_A_Partnership_for_Development_with_the_United_States_of_America_-_1993101201 … https://www.academia.edu/26966465/An_idea_set_forth_in_1992_written_up_in_1993_and_upgraded_in_1997_A_Partnership_for_Development_with_the_United_States_of_America_-_1997030103.doc …https://www.academia.edu/12823841/Mathematical_Model_and_Simulation_for_A_Partnership_for_Development_with_the_United_States_of_America_-_December_1999 …
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