Formation of an optimal investment portfolio of the common stocks by using the model of simple rating – an empirical study in the Iraqi stock exchange. (2021). Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), 26(1), 133-150. https://doi.org/10.55562/jrucs.v26i1.430