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Steven Moran and Antonio Benítez-Burraco (University of Seville) have published their editorial, "The Adaptive Value of Languages: Non-Linguistic Causes of Language Diversity":
https://www.frontiersin.org/articles/10.3389/fpsyg.2018.01827/full
as part of their edited volume (of the same name) in Frontiers in Psychology:
The research topic includes 13 articles by 27 leading scholars on the adaptive value of languages in light of non-linguistic causes of language diversity. The ebook is forthcoming.