Some years ago companies concentrated on the acquisition of new customers and didn’t pay much attention to the establishment of long-term relationships with them. Nevertheless, the development of marketing in the direction of globalisation, increasing competition and new information technologies led to the reorientation of marketing strategies from the transition marketing which focused on single transactions to the relationship marketing which offers a chance to become close to the customers, to satisfy their needs and thus gain competitive advantages on the market. Since then the aim of companies has been to deliver more long-term value for the customers in order to increase their satisfaction and loyalty.Many companies introduce nowadays...