Zabuga, S.I. and M. O. Deyneka , M.O. 2018. Estimation of optimal level of income differentiation using production-institutional functions. Bulletin of V. N. Karazin Kharkiv National University Economic Series. 93 (Jan. 2018), 137-144. DOI:https://doi.org/10.26565/2311-2379-2017-93-14.