The empirical evidence on the cross-sectional relation between idiosyncratic risk and expected stock returns is mixed. We demonstrate that the omission of the previous month's stock returns can lead to a negatively biased estimate of the relation. The magnitude of the omitted variable bias...

Two unique experiments are conducted. First, we evaluate returns to the best value and momentum strategies combined by: (i) a long portfolio of stocks classified as both value stocks and winner stocks; and (ii) a short portfolio of stocks classified as both growth and loser stocks. Second, we...

The empirical evidence on the cross-sectional relation between idiosyncratic risk and expected stock returns is mixed. We demonstrate that the omission of the previous month's stock returns can lead to a negatively biased estimate of the relation. The magnitude of the omitted variable bias...