The share of Google's product listing advertising impressions versus text ads grew 60% in the last four months of 2012 but fell 13% last month, according to a report from Marin Software. The report cited Google Enhanced Campaigns as one reason for the dip but projected that the share of PLA impressions will climb again during the holiday season. Product listing ads perform better than text ads and have a lower cost per click, the report notes.

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