Resistance Level
In technical analysis, a resistance level is a historical price area where selling pressure has previously been strong enough to halt or reverse an advancing price trend, characterized by recurring instances of the price stalling or reversing in that zone.
Resistance is the mirror concept to support in technical analysis. It refers to price zones on a historical chart where an advancing price has repeatedly encountered selling interest sufficient to cap the advance. The rationale proposed by technical analysts is that investors who purchased near a prior high but saw the price subsequently fall may sell when price returns to that level to break even or exit the position — creating historical selling pressure at those levels. Additionally, short sellers who believe the security is overvalued at historically significant levels may add selling pressure near resistance zones.
Like support, resistance levels are identified through historical chart examination. Common historical resistance areas include: prior price highs where the market has historically turned downward, round-number price levels, gap areas created when a stock has historically opened significantly higher or lower than its prior close, and levels derived from technical tools such as moving averages, Fibonacci retracements, and Bollinger Bands.
The concept of 'polarity' in technical analysis describes the historical observation that significant price levels often switch roles: a historical resistance level, once historically broken to the upside with meaningful price action and volume, has frequently acted as support on subsequent pullbacks in historical data. This reflects the changing perceptions of value at historically significant price points among market participants.
Resistance levels — like support levels — are useful for describing and organizing historical price data in a visual framework. They represent areas where, in historical data, supply and demand forces have historically interacted in particular ways. They do not constitute evidence that any particular outcome will occur at those levels in the future. Future price behavior at any given level depends on the balance of buyers and sellers present in the market at that time, which is influenced by factors that technical analysis alone cannot capture.