This paper shows that the systematic risk (or 'beta') of individual stocks increases by an economically and statistically significant amount on days of firm-specific news announcements, and reverts to its average level two to five days later. We employ intra-daily data and recent advances in...

We show that the level of interest rates determines the magnitude of mispricing at the turn of the tax year, as investors face the trade-off between selling a temporarily-depressed stock this year and selling next year, but delaying tax implications by one year. Interest rates do explain the...