PE and EY -he one is just the inverse of the other.Either should be used as a measure against similiar companies or the market as a whole.A low PE could be good or bad it could mean that investors see low earnings growth for this company in the future or the share has been hammered unfairly by the market. Difficult to answer your qustion as pe or ey are one measure but you have to look at more than that to determine value ie latest financials/fundamentals and technicals they all tell a story. I stay away from shares less than r10 mv. normally not much liquidity, high risk, and get hammered the most in bearish markets.