We recently published our State of Paid Search Report 
for Q4 of 2013, and our findings reveal predictable gains across the board for the retail industry. Impressions and clicks increased significantly both YoY and QoQ. Impressions increased 24.4% YoY while clicks increased 5.4% YoY.
Retail CPCs also continued to grow both YoY and QoQ, remaining above the average CPC for all industries. From the previous year, retail CPCs grew 28.8%.
Our data also reveals that mobile devices are becoming increasingly critical to paid search for the retail industry. Smartphone and tablet click share both increased YoY and QoQ. Smartphone click share grew 63.7% YoY while tablet click share increased 20.3% YoY.
For a more detailed look into the current state of paid search marketing, check out our comprehensive report