1. Federal State Statistics Service. Retrieved from http://www.gks.ru/bgd/regl/b15_13/IssWWW.exe/Stg/d01/06–06.doc / Accessed November 12, 2021 (In Russian)
2. Voitov, A. G. (1999). Economy. General course (Fundamental theory of economics). Moscow: Information and Implementation Center “Marketing”, 1999 (In Russian)
3. What do economists mean by “slack”? Retrieved from https://www.cbsnews.com/news/what-do-economists-mean-by-slack/ Accessed November 12, 2021.
4. Wage Differentials. Retrieved from https://www.economicsdiscussion.net/human-resource-management/wage-differentials/wage-differentials/32425 / Accessed November 12, 2021.
5. Ovchinnikov, V. N., Malkina, M. Y. (2019). Determinants of wage inequality in modern Russia. Terra Economicus, 17(3), 30–47. https://doi.org/10.23683/2073–6606–2019–17–3–30–47