Continuous Information, Investor Attention, and Stock Momentum

Summary

This research review presents the frog-in-the-pan hypothesis: investors may respond less promptly to a sequence of small, gradual price moves than to a similarly sized change concentrated in a few sharp moves. It describes an information-discreteness measure built from the proportion and direction of daily returns over a formation period, alongside variants that account for return magnitudes or zero-return days. Stocks with similar prior cumulative returns can therefore be grouped by whether their gains or losses arrived continuously or in bursts.

The reported historical tests find stronger momentum among stocks with more continuous information, while momentum is weaker among stocks whose returns are more discrete. The review relates the pattern to limited investor attention, noting stronger differences among firms with less institutional, analyst, or media coverage. It also reports delayed analyst forecast responses and evidence against disposition effects as the main explanation. These are findings from the cited historical samples and portfolio tests, not a guarantee of future results; the measure is acknowledged to be imperfect, and the evidence depends on sample design and risk adjustments.

Key ideas

• The information-discreteness measure uses the pattern of daily return signs to distinguish gradual moves from concentrated moves.
• Conditional on similar prior returns, the reviewed studies find stronger momentum in stocks with more continuous information.
• The momentum difference is reported to be more pronounced for stocks with lower investor, analyst, and media attention.
• Analyst forecast errors are presented as further evidence of delayed responses to gradual information.
• The measure is imperfect, and historical portfolio results do not establish future profitability.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.