One might recall how price comparison was done before the e-retailers opened their doors. All the information about a product and its price was gathered from the physical store and one was depended on the store-staff and supported elements to provide this information. Whereafter we would visit multiple other stores based on the assumption that these might sell the same product as well. However, it could even occur that a store did not even would carry the product. Finally, after spending the day in several stores it was time to consider which store offered the best deal for example based on price or service.