2026. Factors Determining the Exchange Rate in the Unofficial Market and Their Impact on Domestic Investment in the Libyan Economy: An Econometric Study Using the ARDL Model During the Period (1990-2025). Comprehensive Journal of Science. 11, ملحق 41 (Aug. 2026), 1317–1327. DOI:https://doi.org/10.65405/fn83w754.