Do you want to increase the amount of goods sold? Using only bundles in your e-shop is not enough. You can use cross-selling. It’s a technique consisting in service or product sales, connected with another purchase. In 2006 Jee Bezos revealed that 35% of Amazon sales were a direct result of this technique. That is why it’s worth becoming interested in this topic, because nowadays margins on products are often lower than 10 %. In most cases we base on complementary products. Clients, thanks to good recommendations, realize that they need to buy additional things.