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Answering my own question --- although I don't have a a reference per se, I've been told that if you have no idea at all, -5 is a good ,,first guess``, and there is a paper (and this is what I don't have a reference for, sadly) where the author worked through all the available estimates and arrived at -4,25 as the ,,best guess``.


Elasticities are partial derivatives -- so to estimate them you need to hold all other factors fixed! That would include the prices of other goods.

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