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[edited by: Robert_Charlton at 10:54 pm (utc) on Dec 13, 2013]
Authorship annotation is useful to searchers because it signals that a page conveys a real person’s perspective or analysis on a topic. Since property listings and product pages are less perspective/analysis oriented, we discourage using authorship in these cases. However, an article about products that provides helpful commentary, such as, “Camera X vs. Camera Y: Faceoff in the Arizona Desert” could have authorship.
...there are several inescapable suggestions that... at least with regard to product descriptions... authorship will not be relevant.
As I read it, Google is more or less officially bypassing the issue of who originated product descriptions, and will be looking to factors of site authority, query intent, and to other content on the ecommerce site to determine rankings...