00:00For lump sum investing in a diversified index fund, timing within the month has negligible
00:05long-term impact.
00:06Research on dollar cost averaging versus timing shows the difference in ending returns is
00:12typically under 1-2% over a 10-plus year horizon, dwarfed by whether you're invested at all.
00:18That said, a measurable market anomaly does exist.
00:21Turn-of-the-month effect
00:23Academic studies, Ariel 1987, later confirmed through the 1990s to 2000s.
00:29Found U.S. equity returns are disproportionately concentrated in the last trading day and first
00:35three to four trading days of each month, historically accounting for the majority of
00:39average monthly gains, with mid-month days showing flat to negative average returns.
00:44This is linked to payroll cycles, for O1K contributions, and pension fund rebalancing
00:51hitting markets around month-end-slash-month-start.
00:53Mid-month investing
00:55Statistically the weakest average performance window in these studies.
00:59Though the edge is small, often fractions of a percent, and inconsistent across markets
01:04in years.
01:05Dollar cost averaging, any date, recurring removes the timing question entirely, and is what most
01:11retail investors should default to, since it reduces behavioral risk, panic selling, chasing
01:17rallies, more than it costs in theoretical forever returns.
01:21Context changes the answer.
01:23For large lump sums, institutional or high net worth, micro-timing around month-end can
01:28matter more due to liquidity and rebalancing flows.
01:31For regular retail investors contributing from salary, aligning purchases with payday is
01:37simpler and just as effective.
01:39Geographic market matters too.
01:41The effect is best documented in U.S. equities.
01:44Evidence in other markets is thinner and less reliable, so treat those figures as unconfirmed.
01:50Practical takeaway, don't restructure your schedule around this anomaly.
01:54Automate contributions on a fixed recurring date, e.g., payday, since consistency beats
02:00optimizing a statistically small, non-guaranteed edge.
02:04Finally, remember that everything we discussed today is for educational purposes only and does
02:09not constitute financial advice.
02:11Good luck to everyone, and see you in the next video.
Commentaires