We analyze if the value-weighted stock market portfolio is second-order stochastic dominance (SSD) efficient relative to benchmark portfolios formed on size, value, and momentum. In the process, we also develop several methodological improvements to the existing tests for SSD efficiency. Interestingly, the market portfolio is SSD efficient relative to all benchmark sets. By contrast, the market portfolio is inefficient if we replace the SSD criterion with the traditional mean-variance criterion. Combined these results suggests that the mean-variance inefficiency of the market portfolio is caused by the omission of return moments other than variance. Especially downside risk seems to be important for rationalizing asset pricing puzzles in the 1970s and the early 1980s.

SSD, asset pricing, downside risk, lower partial moments, stock market efficiency
Asset Pricing (jel G12), Corporate Finance and Governance (jel G3), Business Administration and Business Economics; Marketing; Accounting (jel M)
ERIM Report Series Research in Management
Erasmus Research Institute of Management

Post, G.T, & van Vliet, P. (2004). Downside Risk and Asset Pricing (No. ERS-2004-018-F&A). ERIM Report Series Research in Management. Retrieved from http://hdl.handle.net/1765/1424