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Authoritative: http://dx.doi.org/10.1017/S0140525X08005098   (Publisher's PDF... likely be available here.)

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Abstract

Selection through iterated learning explains no more than other non-functional accounts, such as Universal Grammar (UG), why language is so well designed for communicative efficiency. It does not predict several distinctive features of language, such as central embedding, large lexicons, or the lack of iconicity, which seem to serve communication purposes at the expense of learnability.

@article{dessalles08BBScomments,
  author={Jean-Louis Dessalles},
  title={Why is language well designed for communication?},
  journal={Behavioral and Brain Sciences},
  year={2008},
  volume={31},
  number={5},
  pages={518-519},
  doi={10.1017/S0140525X08005098},
  url={http://www.isrl.uiuc.edu/~amag/langev/paper/dessalles08BBScomments.html}
}