mahmood, Z. makki 2022. Building the optimal investment portfolio according to the simple gradual method, with the shadow of allowing and not allowing short selling: An applied study in the Iraq Stock Exchange. Tikrit Journal of Administrative and Economic Sciences. 18, 60, 3 (Dec. 2022), 500–520. DOI:https://doi.org/10.25130/tjaes.18.60.3.28.