23. The product summary generator of claim 22 , wherein the recommendation made by the summary generation module is an advertisement for which compensation is received in exchange for recommending the selected alternative product.
23. The product summary generator of claim 22 , wherein the recommendation made by the summary generation module is an advertisement for which compensation is received in exchange for recommending the selected alternative product. 24. The product summary generator of claim 23 , wherein the amount of compensation is based on at least one of frequency of the recommendation and number of recommended products sold that is attributable to the recommendation.