Price memory is real. The zones where buyers and sellers previously fought hardest become the most important areas on any chart.
Markets are driven by human decisions β and humans remember where they were wrong. A trader who bought at a level and got stopped out will sell the moment price returns there, creating resistance. This is why support and resistance levels work.
A strong zone has three characteristics:
When price breaks below a support level, that same level becomes resistance. This is called a role reversal and is one of the most reliable setups in price action trading.
Old floor becomes new ceiling. The market has a long memory.
Psychological levels β round numbers like 1.2000 or $50,000 β attract orders because traders mentally anchor to them. If your key level is also a round number, it's stronger.