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		| Keunkwan  Ryu and Yong  Yoon | 
	
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		| ''Convergence or confusion? A study of world economic growth'' | 
	
		| ( 2020, Vol. 40 No.4 ) | 
	
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		| This paper takes a closer look at the typical growth convergence regression of Barro (1991), Mankiw, Romer and Weil (1992), Sala-i-Martin (1996), and others. By interpreting the two components of the regression coefficient separately, i.e. the correlation coefficient and the ratio of standard deviations, we distinguish between "time-series" convergence and "cross-section" convergence, and consequently the relationship between β− and σ−convergence. And, using data from the latest Penn World Table database (version 9.1), we investigate the convergence or the lack-of-convergence in samples of countries representing the “World”, OECD and Sub-Saharan Africa. The implications of this study for the neoclassical growth model are also discussed. | 
	
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		| Keywords: Economic growth,  convergence | 
	
		| JEL: O4 - Economic Growth and Aggregate Productivity: General 
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		| | Manuscript Received : Aug 11 2019 |  | Manuscript Accepted : Oct 12 2020 | 
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