We added a graph that shows the evolution of prices for the product you are checking. As we keep track of each time a product is compared (during the last 3 months), we know the original price it had. The graph is made using the original price at the moment it was compared, uniformised to € or $ at the current exchange rates.
Let's check for example Free Prize Inside!, the last book from marketing guru Seth Godin :
Sometimes it's curious, sometimes its damn interesting.. You can see and track special promotions, offers, discounts..
We've put the graphs, it's up to you to use them in a cool way now..