This article examines inequalities between and within 57 countries, categorized by income levels, for efficiency in pro-duction and output per worker for 1965 and 1990. Regression analysis was also employed as a basis of convergence from which countries were evaluated for their potential to actual performance in efficiency and output over a span of 25 years. The findings indicate that gaps between the groups of countries widened as compared to gaps within the groups. Convergence was found to increase between the groups of countries as their income levels rose.
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