The aim of this study is comparing the performance of common stock & treasury bills, according to the central bank of Egypt and their monetary policy during the time period between “1994-2017”, using descriptive & inferential statistical methods. The Study concluded that there is a strong positive relationship between inflation rate & returns of Egyptian treasury bills, as the same relation as with floating Egyptian pound.in addition, the study found the impact of Inflation and Floating on the return of Egyptian T-bills, but don’t found this impact on the return of Egyptian common stock. Finally, the study founds the same average return but a different at variances of this return & the Coefficient of variation.