← Search Journal of Finance Vol. 28 No. 3 1973 Portfolio Returns and the Random Walk Theory: Reply Pao L. Cheng; M. King Deets DOI10.2307/2978644 Volume28 Issue3 Pages742 Sources semanticscholar openalex crossref Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓