The search giant, which has both an obsession with empirical data and a vested interest in proving the effectiveness of its own advertising products, combined those two things and produced a series of experiments with some of its advertisers.

The results were positive enough that Google produced a promotional video touting them. According to the video, advertisers saw an increase in in-store sales thanks to online advertising and some saw a return on their ad spend as high as fifteen times.

Have you noticed a relationship between online advertising and offline sales? Let us know in the comments.