Internet Retailer: Does online advertising work? A retailer pulls online ads to find out

Techno Scout wanted to know how well their online advertising was doing in terms of generating online sales, so taking a somewhat extreme approach, they stopped all online advertising for three month. The result: Online sales dropped 45%.

Although clearly an effective way of ascertaining the significance of your online advertising, large scale loss of sales is a fairly high price to pay for such knowledge. If you are in charge of your company's online marketing I'd recommend that you check first with your boss before following this approach.