Baasandulam Mavidkhaan, Saikhnaa Munkh-Erdene, Erdenetsetseg Baasanjav, Gerelsuren Gaanjuur and Adiyabaatar Gulguu 2025. RESEARCH ON THE IMPACT OF INVESTMENT ON GREEN ECONOMIC EFFICIENCY - BASED ON ANALYSIS OF 21 PROVINCES IN MONGOLIA. International Journal of Innovative Technologies in Social Science. 2(46) (Apr. 2025). DOI:https://doi.org/10.31435/ijitss.2(46).2025.3303.