Sourced from eMarketer.com
According to a recent report from Oneupweb, search engine user clicks tend to present higher conversion rates the longer the keyword phrase.
Looking at data from high-traffic keyword phrases for sites that were optimized by Oneupweb, the search engine optimization firm found that conversion rates grew the longer the keyword string, peaking at four words. The results were the same in all three months studied.
The results in the above chart do not include any searches conducted with corporate names, as these searches tend to imply a higher conversion rate, meaning the searcher is more likely to already be looking to purchase something from the company in question