Prior day, week, and month highs and lows

Yesterday remembers

Some of the strongest intraday levels do not come from drawing swing points or marking round numbers. They come from looking at where price stopped yesterday. The prior day's high. The prior day's low. The prior week's high and low. The prior month's high and low. These are real, mechanical, well-defined levels that thousands of participants reference every session. And price reacts at them constantly.

Why do they work? Two reasons. First — institutional algos. Many execution algorithms used by banks and hedge funds explicitly reference prior-period extremes as targets, reversal zones, or stop placements. When the chart approaches yesterday's high, real automated flow engages. Second — retail. The prior-day high is one of the few levels that every trading platform plots automatically. Beginners watch it. Professionals watch it. The level becomes a self-fulfilling reference point.

How to use them in practice. Start each session by marking three things — yesterday's high, yesterday's low, and the previous week's high and low. On a longer chart, also mark the prior month's high and low. You will end up with four to six horizontal references. When price approaches one of them, slow down. That is a candidate reaction zone. Look at how the candle prints. A clean rejection wick at the prior-day high is one of the cleaner intraday signals you can wait for.

One caution. Prior-period levels matter most in the session immediately after they form. Yesterday's high matters a lot today, somewhat tomorrow, and barely by next week. Last month's high stays relevant for several weeks. So weight them by recency. The freshest extreme is the loudest reference. Old extremes still matter but only when nothing fresher is in play.

Recap: prior day, week, and month highs and lows are real intraday S/R. Mark them every session, weight them by recency, and watch how price reacts when it gets there.