How to Effectively Build Marketing in the Digital Era Economies Akmaral Orazymbetova, Berik Bekmurzayev, Akmaral Kazykeshvova, Svetlana Faizullina and Asel Kogabayeva E3S Web Conf., 159 (2020) 04026 Published online: 24 March 2020 DOI: 10.1051/e3sconf/202015904026