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The concepts of support and resistance are undoubtedly two of the most highly discussed attributes of technical analysis. Part of analyzing chart patterns, these terms are used by traders to refer to price levels on charts that tend to act as barriers, preventing the price of an asset from getting pushed in a certain direction. At first, the explanation and idea behind identifying these levels seems easy, but as you'll find out, support and resistance can come in various forms, and the concept is more difficult to master than it first appears.

Defining Support and Resistance

Support is a price level where a downtrend can be expected to pause due to a concentration of demand. As the price of a security drops, demand for the shares increases, thus forming the support line. Meanwhile, resistance zones arise due to a sell-off when prices increase.

Once an area or "zone" of support or resistance has been identified, it provides valuable potential trade entry or exit points. This is because, as a price reaches a point of support or resistance, it will do one of two things – bounce back away from the support or resistance level, or violate the price level and continue in its direction – until it hits the next support or resistance level.

Most forms of trades are based on the belief that support and resistance zones will not be broken. Whether price is halted by the support or resistance level, or it breaks through, traders can "bet" on the direction and can quickly determine if they are correct. If the price moves in the wrong direction, the position can be closed at a small loss. If the price moves in the right direction, however, the move may be substantial.

[Support and resistance levels are important concepts in technical analysis, since they can be used to identify potential long and short opportunities. If you're interested in moving beyond these concepts, the Technical Analysis course on the Investopedia Academy provides a comprehensive introduction to basic and advanced technical analysis, chart patterns and technical indicators. You'll also learn about risk management and how to set price targets in over five hours of on-demand video, exercises and interactive content.]

The Basics

Most experienced traders will be able to tell many stories about how certain price levels tend to prevent traders from pushing the price of an underlying asset in a certain direction. For example, assume that Jim was holding a position in a stock between March and November and that he was expecting the value of the shares to increase.

Let's imagine that Jim notices that the price fails to get above $39 several times over several months, even though it has gotten very close to moving above that level. In this case, traders would call the price level near $39 a level of resistance. As you can see from the chart below, resistance levels are also regarded as a ceiling because these price levels prevent the market from moving prices upward.

Chart with an example of a resistance level
Figure 1

On the other side of the coin, we have price levels that are known as support. This terminology refers to prices on a chart that tend to act as a floor by preventing the price of an asset from being pushed downward. As you can see from the chart below, the ability to identify a level of support can also coincide with a good buying opportunity, because this is generally the area where market participants see good value and start to push prices higher again. (See also: The Psychology of Support and Resistance Zones.)

Chart showing an example of a support level
Figure 2

Trendlines

The examples above show a constant level prevents an asset's price from moving higher or lower. This static barrier is one of the most popular forms of support/resistance, but the price of financial assets generally trends upward or downward, so it is not uncommon to see these price barriers change over time. This is why understanding the concepts of trending and trendlines is important when learning about support and resistance.

When the market is trending to the upside, resistance levels are formed as the price action slows and starts to pull back toward the trendline. This occurs as a result of profit taking or near-term uncertainty for a particular issue or sector. The resulting price action undergoes a "plateau" effect, or a slight drop-off in stock price, creating a short-term top.

Many traders will pay close attention to the price of a security as it falls toward the broader support of the trendline because historically this has been an area that has prevented the price of the asset from moving substantially lower. For example, as you can see from the Newmont Mining Corp (NEM) chart below, a trendline can provide support for an asset for several years. In this case, notice how the trendline propped up the price of Newmont's shares for an extended period of time. (See also: Identifying Market Trends.)

Chart showing an example of an uptrend
Figure 3

On the other hand, when the market is trending to the downside, traders will watch for a series of declining peaks and will attempt to connect these peaks together with a trendline. When the price approaches the trendline, most traders will watch for the asset to encounter selling pressure and may consider entering a short position because this is an area that has pushed the price downward in the past.

The support/resistance of an identified level, whether discovered with a trendline or through any other method, is deemed to be stronger the more times that the price has historically been unable to move beyond it. Many technical traders will use their identified support and resistance levels to choose strategic entry/exit points because these areas often represent the prices that are the most influential to an asset's direction. Most traders are confident at these levels in the underlying value of the asset, so the volume generally increases more than usual, making it much more difficult for traders to continue driving the price higher or lower.

Round Numbers

Another common characteristic of support/resistance is that an asset's price may have a difficult time moving beyond a round price level such as $50. Most inexperienced traders tend to buy or sell assets when the price is at a whole number because they are more likely to feel that a stock is fairly valued at such levels. Most target prices or stop orders set by either retail investors or large investment banks are placed at round price levels rather than at prices such as $50.06. Because so many orders are placed at the same level, these round numbers tend to act as strong price barriers. If all the clients of an investment bank put in sell orders at a suggested target of, for example, $55, it would take an extreme number of purchases to absorb these sales and, therefore, a level of resistance would be created. (For more, see: Numbers That Display Profitable Trading Opportunities.)

Moving Averages

Most technical traders incorporate the power of various technical indicators, such as moving averages, to aid in predicting future short-term momentum, but these traders never fully realize the ability these tools have for identifying levels of support and resistance. As you can see from the chart below, a moving average is a constantly changing line that smooths out past price data while also allowing the trader to identify support and resistance. Notice how the price of the asset finds support at the moving average when the trend is up, and how it acts as resistance when the trend is down.

Chart showing moving average acting as support and resistance level

Figure 4

Traders can use moving averages in a variety of ways, such as to anticipate moves to the upside, when price lines cross above a key moving average, or to exit trades, when the price drops below a moving average. Regardless of how the moving average is used, it often creates "automatic" support and resistance levels. Most traders will experiment with different time periods in their moving averages so that they can find the one that works best for this specific task. (See also: How to Use a Moving Average to Buy Stocks.)

Other Indicators

In technical analysis, many indicators have been developed to identify barriers to future price action. These indicators seem complicated at first, and it often takes practice and experience to use them effectively. Regardless of an indicator's complexity, however, the interpretation of the identified barrier should be consistent to those achieved through simpler methods.

For example, the Fibonacci retracement tool is a favorite among many short-term traders because it clearly identifies levels of potential support/resistance. The reasoning behind how this indicator calculates the various levels of support and resistance is beyond the scope of this article, but notice in Figure 5 how the identified levels (dotted lines) are barriers to the short-term direction of the price. (For more, see: Fibonacci and the Golden Ratio.)

Chart showing Fibonacci retracement levels acting as price barriers
Figure 5

Measuring the Significance of Support and Resistance Zones

Remember how we used the terms "floor" for support and "ceiling" for resistance. Continuing the house analogy, a security is like a rubber ball that bounces in a room will hit the floor (support) and then rebound off the ceiling (resistance). A ball that continues to bounce between the floor and the ceiling is similar to a trading instrument that is experiencing price consolidation between support and resistance zones. Now imagine that the ball, in mid-flight, changes to a bowling ball. This extra force, if applied on the way up, will push the ball through the resistance level; on the way down, it will push the ball through the support level. Either way, extra force, or enthusiasm from either the bulls or bears, is needed to break through the support or resistance.

Often, a support level will eventually become a resistance level when the price attempts to move back up, and conversely, a resistance level will become a support level as the price temporarily falls back. Price charts allow traders and investors to visually identify areas of support and resistance, and they give clues regarding the significance of these price levels. More specifically, they look at:

Number of touches. The more times the price tests a support or resistance area, the more significant the level becomes. When prices keep bouncing off a support or resistance level, more buyers and sellers notice and will base trading decisions on these levels.

Preceding Price Move. Support and resistance zones are likely to be more significant when they are preceded by steep advances or declines. For example, a fast, steep advance (or uptrend) will be met with more competition and enthusiasm and may be halted by a more significant resistance level than a slow, steady advance. A slow advance may not attract as much attention. This is a good example of how market psychology drives technical indicators.

Volume at Certain Price Levels. The more buying and selling that has occurred at a particular price level, the stronger the support or resistance level is likely to be. This is because traders and investors remember these price levels and are apt to use them again. When strong activity occurs under high volume and the price drops, a lot of selling will likely occur when price returns to that level, since people are far more comfortable closing out a trade at the breakeven point rather than at a loss.

Time. Support and resistance zones become more significant if the levels have been tested regularly, over an extended period of time.

The Bottom Line

Support and resistance levels are one of the key concepts used by technical analysts and form the basis of a wide variety of technical analysis tools. The basics of support and resistance consist of a support level, which can be thought of as a floor under trading prices, and a resistance level, which can be thought of as the ceiling. Prices fall and test the support level, which will either "hold," and price will bounce back up, or the support level will be violated, and the price will drop through the support and likely continue lower to the next support level.

Determining future levels of support can drastically improve the returns of a short-term investing strategy, because it gives traders an accurate picture of what price levels should prop up the price of a given security in the event of a correction. Conversely, foreseeing a level of resistance can be advantageous because this is a price level that could potentially harm a long position, signifying an area where investors have a high willingness to sell the security. As mentioned above, there are several different methods to choose when looking to identify support/resistance, but regardless of the method, the interpretation remains the same – it prevents the price of an underlying from moving in a certain direction. (To read about what happens when an asset breaks free of an identified level, check out: Support and Resistance Reversals.)

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