Smartphone CPCs in the US are 46% cheaper than desktop at $0.30 and $0.56 respectively,according to Q1 data from Kenshoo.
In comparison, tablet CPCs are just 18% lower than desktop at $0.46.
This highlights the fact that it is still relatively cheap for businesses to target customers through mobile search campaigns, an opportunity that many brands are failing to take advantage of.
Unsurprisingly though, the Kenshoo report shows that desktop still accounts for the vast majority of US search spend (86.1%) and clicks (81.2%), though smartphone and tablet clicks are proportionately higher than the amount of budget currently allocated to them.
Q1 2013 US search advertising clicks and spend by device