Round-number clusters behind support and pattern signals

The chart object is a resting book

A support-resistance zone is a published or observed price zone used as a bounce-or-break hypothesis over an intradayan-to-multiweek window. Head-and-shoulders is a three-peak chart structure scored as a position signal and then compared with simpler rules and with actual volume around the entry day. A round-number-cluster is a pile-up of take-profits at whole numbers and 50s, with stop-losses parked just beyond those same prints.

Editorial reading: treat the support line, the neckline, and the round number as one execution problem. First map which resting order type sits at the level. Then decide whether the next event is a bounce, a through-level surge, or a crowded pattern that never fills.

When the neckline already sat in simpler rules

On daily exchange rates spanning about 20 years, head-and-shoulders signals overlapped the positions of simpler moving-average and filter rules, and those simpler rules were correct more often.

On daily prices for 100 randomly chosen equities, the same pattern failed an average-profitability test, yet extra volume peaked on the day a pattern-based position would have been opened and then faded over the next few days.

Editorial: volume that peaks on the entry day can mark a crowded print rather than a leftover ticket that still fills.

Round-number tickets and the same-direction surge

Almost 10,000 stop-loss and take-profit orders from one major foreign-exchange bank, collected over about six months in three currency pairs, showed take-profits stacked at round numbers. Stop-loss buys sat just above whole numbers and 50s, and stop-loss sells sat just below them, so a crossing of the round number could trigger more flow in the same direction.

Resting orders clustered most at prices ending in zero, next at those ending in five, and seldom at endings of one, four, six, or nine.

Order-flow-analysis reads those clustered stop-loss and take-profit tickets, buy-versus-sell initiation, and volume timing to judge what is executable at the level.

Published zones versus arbitrary levels

A bounce was scored if the rate was still above support or still below resistance after 15 minutes, and those frequencies were judged against 10,000 bootstrap sets of arbitrary levels.

Daily support and resistance levels circulated by six private firms over a couple of late-1990s years predicted intradayan turnarounds better than arbitrary numbers. One firm beat that benchmark in 26 of 28 monthly windows on dollar-yen.

Path-dependence after the 15-minute clock

Because the next increment depends on the exact printed level, clustered conditional orders create path-dependence that can stretch beyond a 15-minute window and help explain why short-horizon macro forecasts struggle.

Stop-loss clusters can generate more unusually large moves than expected, while take-profits at round numbers can halt a trend and generate more unusually small moves.

Editorial: a bounce at 15 minutes does not retire stop-loss tickets parked just beyond the same print, so the later event can still be a through-level surge rather than a completed hold.