BUILD AN EFFICIENT INVESTMENT PORTFOLIO USING THE WILLIAM RATIO (EMPIRICAL STUDY) IN IRAQ STOCK EXCHANGE: BUILD AN EFFICIENT INVESTMENT PORTFOLIO USING THE WILLIAM RATIO (EMPIRICAL STUDY) IN IRAQ STOCK EXCHANGE. (2020). Iraqi Journal of Market Research and Consumer Protection, 12(1), 1-13. https://jmracpc.uobaghdad.edu.iq/index.php/IJMRCP/article/view/184