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![PDF] The value of language skills A common language facilitates communication and economic efficiency, but linguistic diversity has economic and cultural value too | Semantic Scholar](https://i0.wp.com/d3i71xaburhd42.cloudfront.net/d45e525687226dc36e9d0f84b37eb7eae9ac623d/4-Figure1-1.png)
how many research about languages
