September was marked by acceleration in several paid search growth trends observed in recent months for online retailers. PM Digital’s September 2011 Rewind Index, which measures monthly U.S. paid search performance for online retail clients, found 26% year-over-year growth in clicks and even stronger 46% growth in revenue—the largest monthly increases in both metrics since last December. Both are great indicators heading into Holiday 2011. What’s more, average order increased 10% year-over-year—the biggest increase tracked this year. PM Digital clients also increased total spend by an average 27%, while CPCs held steady.
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