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Support and Resistance: Price Levels, Hindsight and Why They Fail

Support and resistance are price levels where falling or rising prices have tended to stall. How chart readers draw them, role reversal, and why levels break.

By Published 4 min read

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AI-assisted article. Drafted with AI tools from the sources cited below and checked by automated tests and an AI editorial review. No person has reviewed it yet. How we write and check articles.

Key takeaways

  • Support is a price level where falling prices have tended to stall; resistance is a level where rising prices have tended to stall.
  • Chart readers usually mark support at previous lows and resistance at previous highs, often as zones rather than exact prices.
  • ChartSchool describes role reversal: broken support can act as resistance, and broken resistance as support.
  • Levels are drawn with hindsight and can break; a level that held before is no guarantee it will hold again.
  • Stop orders placed just beyond obvious levels can trigger together, which can make moves through a level sharper.

On many price charts you can see prices bouncing off certain levels more than once, falling to roughly the same low or stalling near the same high. Chart readers call these levels support and resistance. The idea is intuitive. It is also easy to overrate, because levels that look obvious afterwards were rarely obvious at the time.

The definitions

StockCharts' ChartSchool describes support and resistance as key junctures where supply and demand meet:

  • Support is the price level at which demand is thought to be strong enough to prevent the price from declining further. As the price falls toward it and gets cheaper, buyers become more inclined to buy and sellers less inclined to sell.
  • Resistance is the price level at which selling is thought to be strong enough to prevent the price from rising further.

Note the hedged wording in the source: "thought to be", "it is believed". These are descriptions of how traders reason about levels, not physical barriers.

Where the levels come from

ChartSchool's practical rule: support can be established with previous reaction lows, and resistance with previous reaction highs.

A hypothetical example. A stock falls to $40 in March, recovers to $48, falls back to $40.50 in May, and recovers again. Chart readers would mark a support zone around $40 to $40.50 and resistance near $48. If the price later approaches $40 a third time, they will watch whether buyers appear again.

Because prices often poke briefly through a level, ChartSchool notes it does not seem logical to call a level broken when the price closes a fraction beyond it, and that some traders establish zones rather than exact lines.

Role reversal

ChartSchool describes another widely used principle: support can turn into resistance and vice versa. Once a price breaks below support, the broken level can act as resistance if the price returns to it; once it breaks above resistance, that level can act as support.

ChartSchool's explanation is about supply and demand. A break below support signals that the forces of supply have overcome demand, so if the price returns to that level, extra supply is likely to appear; a breakout above resistance shows demand has overwhelmed supply, so a return to the level is likely to find buyers.

A hypothetical walk-through

Suppose a stock has turned down near $60 three times over several months, so chart readers mark resistance there.

  1. Breakout. One day it closes at $61.50 on heavy volume. Readers who follow the role-reversal idea now treat $60 as possible support.
  2. Retest. Over the next week it drifts back to $60.20 and turns up again. In hindsight, the old resistance "held" as support.
  3. Or a false breakout. Alternatively, it slips back to $58 within two days. The breakout failed, and anyone who bought at $61.50 on the strength of it is now sitting on a loss.

Both outcomes are possible, and nothing on the chart at step 1 reliably tells you which will happen. That is the core limitation of the method.

Why levels break

ChartSchool is clear that support does not always hold, and a break below it signals that sellers have overwhelmed buyers; resistance does not always hold either. Reasons levels fail include:

  • New information. Earnings or news can carry a price straight through a level that held for months.
  • Hindsight. Many levels are identified after the fact; in real time there are often several plausible levels.
  • Crowded stops. If many traders place stop orders just beyond an obvious level, a move through it can trigger them together. The SEC's investor bulletin warns that a stop order becomes a market order once triggered and can execute well away from its stop price, so a burst of triggered stops can make a move through a level sharper rather than softer.

ChartSchool's broader overview adds a general caution: not all technical signals and patterns work, and what works for one stock may not work for another.

Using levels without over-trusting them

  • Describe, then interpret. Note where prices have turned before, without assuming they will again.
  • Check the context: the trend, trading volume and any upcoming news.
  • Combine with other views. ChartSchool notes moving averages can be used to define potential support and resistance levels, with the same caveats.
  • Keep the business in mind. A company's results can matter more than any line on a chart; technical versus fundamental analysis compares the two ways of thinking.

The store screenshots for Learn to Trade Stocks Beginner list lessons on trends and key levels, and its listing states that technical indicators cannot confirm a future outcome or remove uncertainty. Its chart replay lets you step forward through simulated prices and see whether a level you noted held, using a virtual balance. It is one of our education apps; the investing basics hub has the related chart guides, including how to read candlestick charts.

Good to know

Frequently asked questions

What are support and resistance?
Support is a price level at which demand has been strong enough to stop a decline; resistance is a level at which selling has been strong enough to stop an advance. ChartSchool describes them as key junctures where supply and demand meet.
Why does broken support turn into resistance?
ChartSchool's explanation is that a break below support signals the forces of supply have overcome demand, so when the price returns to that level, extra supply is likely to appear. ChartSchool presents role reversal as a principle of technical analysis, not a certainty.
How do you draw support and resistance?
Mark previous reaction lows for support and previous reaction highs for resistance. Because prices often poke briefly beyond a level, ChartSchool notes that some traders draw zones rather than single lines.
Why do support and resistance levels fail?
Because they describe where prices turned in the past, not commitments for the future. News, earnings or a shift in sentiment can carry a price straight through a level, and many levels look obvious only in hindsight.

Sources

  1. Support & Resistance (ChartSchool) (opens in a new tab)StockCharts.com — accessed
  2. Technical Analysis (ChartSchool) (opens in a new tab)StockCharts.com — accessed
  3. Stop, Stop-Limit, and Trailing Stop Orders – Investor Bulletin (opens in a new tab)Investor.gov, U.S. Securities and Exchange Commission — accessed
  4. Moving Averages – Simple and Exponential (ChartSchool) (opens in a new tab)StockCharts.com — accessed

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