Nykyforchyn, I. 2026. Model of Non-Linear Pricing with Lower Constraints on Buyers’ Utilities. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number. 22(83) (Apr. 2026), 112–124. DOI:https://doi.org/10.31471/2304-7399-2026-22(83)-112-124.