APPROACHES TO DIAGNOSING THE EFFECTIVENESS OF MARKETING TOOLS IN MEDIA COMPANIES Authors I. Barkov https://orcid.org/0009-0008-8432-7276 DOI: https://doi.org/10.32702/2307-2105.2025.10.126%20 Downloads pdf (Українська) Published 2025-10-16 Issue No. 10 (2025): Efektyvna ekonomika Section Статті