File S1 - Measuring the Intangibles: A Metrics for the Economic Complexity of Countries and Products

Auxiliary results and definitions. Sec. 1 Revealed Comparative Advantage, Sec. 2 Further considerations on the weighted matrix M, Sec. 3 Further considerations on the triangularity of the country-product matrix, Sec. 4 Algebraic approach to the Method of Refections and convergence to trivial fixed points and Sec. 5 Comparison of Fitness with the Global Competitiveness Index.
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