2026. The Effect of Downstream Policies, Exchange Rates, Production and International Prices on Indonesia’s Nickel Export Volume with Global Demand as a Mediator Variable for the 2015-2024 Period. HORIZON: Indonesian Journal of Multidisciplinary. 4, 4 (Jul. 2026), 3782–3800. DOI:https://doi.org/10.54373/hijm.v4i4.6650.