====== Balassa index ======

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0212941

 revealed comparative advantage,
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  * https://en.wikipedia.org/wiki/Revealed_comparative_advantage
  * https://wits.worldbank.org/wits/wits/witshelp/Content/Utilities/e1.trade_indicators.htm
  * https://www.mdpi.com/2227-7099/9/2/48/pdf
  * https://www.researchgate.net/publication/314570988_Net_Comparative_Advantage_Index_Overcoming_the_Drawbacks_of_the_Existing_Indices

Net comparative advantage index - overcoming the drawbacks of the existing indices

Vollrath, T.L. (1991): A Theoretical Evaluation of Alternative Trade Intensity Measures of Revealed Comparative Advantage. Weltwirtschaftliches Archiv, 130, 265–279. https://link.springer.com/article/10.1007%2FBF02707986

On the empirical distribution of the Balassa index Jeroen Hinloopen & Charles Van Marrewijk  Weltwirtschaftliches Archiv volume 137, pages1–35 (2001)Cite this article

Keld Laursen: Revealed comparative advantage and the alternatives as measures of international specialization Eurasian Business Review volume 5, pages99–115 (2015)Cite this article