be applied for not only high BM firms, but also
for all firms. Moreover, our results contribute to
the literature on the efficient market hypothesis.
Specifically, our results that investors can use
publicly available, historical accounting information
to choose stocks and earn abnormal stock returns
seem to suggest that Thai stock markets are not
semi-strong form efficient.
The next section of this paper discusses
literature review. Section 3 discusses a construction
of composite scores, stock return calculation as
well as sample selection and data collection.
Section 4 present empirical results. Finally, section
5 concludes the paper.