| Sumario: | We analysed Education First's Standard English Test scores coming from 2 mln learners of English in 109 countries world-wide. Proficiency in English as a global lingual franca is an important skill in various areas of international communication. A larger linguistic distance between English as a second language and a learner's first language has been put forward as increasing the efforts or costs of learning English. Instead of the subjective measures used in the past, we constructed a quantitative linguistic distance measure based on comparing words (lexicon), constructions (morpho-syntax), and sounds (phonology) between English and 59 mother tongues. Mixed regression analyses were carried out on the countries' proficiency scores with a country's human capital index, the official status of English in a country, and linguistic distance as predictors. All three predictors turn out to be robust proficiency determinants. Language skills constitute an essential component of human resources in today's emerging and growing knowledge economy. These skills cannot be taken for granted and additional language training is required when linguistic distances are large.
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