Stock Rit Rmt ai Beta A 10.6% 15% 0 0.8…

Stock Rit Rmt ai Beta A 10.6% 15% 0 0.8 Z 9.8% 8.0% 0 1.1 ​ Rit = return for stock i during period t Rmt = return for the aggregate market during period t   What is the abnormal rate of return for Stock Z during period t using only the aggregate market return (ignore differential systematic risk)?