The study of the phenomenon of self-employment and its role in the national economy: the case of KazakhstanDinara Rakhmatullayeva, Guliya Iliyashova, Altynai Maukenova and Yernazar IshanovE3S Web Conf., 159 (2020) 06015DOI: https://doi.org/10.1051/e3sconf/202015906015