With just a glance you can see all the goods of a category in the relative value chart by price and select them for comparison. On the other hand, when you compare two products, by looking at the colors green and red, you can see which features of the new product are better and which are weaker than the previous product. In the price list, you can see how much it is cheaper or more expensive with green and red colors. This way, you can make your purchasing decision much more easily.