Support and resistance

In simple terms

When a falling share repeatedly stops and turns up around the same price, traders call that area support. When a rising share repeatedly stalls around the same price, they call it resistance.

These ideas describe where buying or selling has appeared before. They are useful as context, but they are not floors or ceilings, and they break regularly.

Why levels form

Several things can make buyers or sellers cluster around a price:

• Memory. People who bought near a previous high and saw the price fall may sell when it returns there, to get out at break-even. People who missed buying at a low may buy if it returns.
• Waiting orders. Limit orders cluster at levels traders are watching, which shows up in the order book.
• Round numbers. Prices such as ₹100, ₹500 or ₹1,000 attract orders simply because they are easy to remember and choose.
• Heavy trading areas. Prices at which a lot of volume traded represent many investors' buying prices.
• Self-fulfilment. Because many traders watch the same levels, their orders can make the levels matter, at least for a while.

Zones, not lines

Orders do not all sit at one exact price. A support "level" is usually a zone a few percent wide.

Role reversal

When a price breaks clearly through a level, the level often changes role.

• Broken resistance becomes support: a share that finally rises above a level where it stalled several times may later fall back to that level and find buyers there.
• Broken support becomes resistance: a share that falls through a level where it bounced may later rise back to it and meet sellers.

This is a tendency, not a rule, and the breakouts lesson discusses how to treat it as a testable hypothesis.

How reliable are levels?

Support and resistance are among the most widely used chart ideas, and also among the most subjective. Points to keep in mind:

• Hindsight makes them look better than they are. On a past chart, the levels that held are obvious; the ones that failed are forgotten.
• News overrides levels. Results, regulation or a market-wide fall can push a price straight through any level.
• The more a level is tested, the more debate there is about whether it is getting stronger or weaker; both views exist, and neither is reliable.
• Thinly traded shares have unreliable levels built on a few trades.

Using levels sensibly

Support and resistance are best used to plan, not to predict:

1. Mark zones from past swing highs and lows, round numbers and heavy-volume areas.
2. Treat each zone as a place where something may happen, not where it will.
3. Decide in advance what you would do if a zone holds and if it breaks, as the entry and exit planning lesson explains.
4. Remember that stop-loss orders placed just beyond obvious levels are common, which can cause sharp moves when those levels break.

Why it matters

Support and resistance appear in almost every chart analysis, trading tip and market comment. Understanding why they form, why they are zones, and how often they fail helps you use them as context while avoiding the costly belief that a price "cannot" go through a level.

Limitations

Drawing levels is subjective; two analysts will often mark different zones. Levels that held in the past are not guaranteed to hold again, and their apparent reliability on past charts is inflated by hindsight. They tell you nothing about a company's value.

Common mistakes

• Treating support as a floor and resistance as a ceiling.
• Drawing exact lines instead of zones.
• Remembering the levels that held and forgetting the ones that failed.
• Ignoring news that can override any level.

Try it yourself

1. Choose a share and open its daily chart for the last two years.
2. Mark support and resistance zones from swing highs and lows, and note any round numbers nearby.
3. Count how many times the price touched each zone and how many times it broke through.
4. Find one example of role reversal, and one where a level simply failed.