References
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https://techonomicblog.wordpress.com/2015/11/23/4-determinants-of-productivity/
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http://www.businessdictionary.com/definition/law-of-diminishing-returns.html
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https://www.investopedia.com/terms/l/lawofdiminishingmarginalreturn.asp
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https://www.quora.com/Are-there-in-real-life-example-of-Convergence-economics-in-our-world-today
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https://www.uschamber.com/report/benefits-international-investment
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http://dfat.gov.au/trade/topics/investment/Pages/the-benefits-of-foreign-investment.aspx
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http://www.epi.org/publication/states-education-productivity-growth-foundations/
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http://www.sciencedirect.com/science/article/pii/S0014292197000810
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http://www.sanandres.esc.edu.ar/secondary/economics%20packs/development_economics/page_43.htm
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http://open.lib.umn.edu/macroeconomics/chapter/19-2-population-growth-and-economic-development/
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https://www.innovationfiles.org/fueling-innovation-the-role-of-rd-in-economic-growth/
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http://www.imf.org/external/datamapper/NGDP_RPCH@WEO/OEMDC/ADVEC/WEOWORLD/NPL/USA
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https://mpra.ub.uni-muenchen.de/43346/1/MPRA_paper_43346.pdf