Naghizadeh,A , , yazdanian,N , , mirarab baygi,S A , and kiumars,A . "The relationship between the shadow economy and the elements of competitiveness in developing oil countries", International Journal of Finance & Managerial Accounting, 8, 30, 2023, 361-375. doi: 10.30495/ijfma.2023.71221.1958