Technical Analysis – and Its Limits

Anyone looking at a stock chart for the first time spots patterns right away: lines that repeat, highs where the price keeps bouncing back, trends that seem to continue. Technical analysis is built on that observation. It’s popular, built into nearly every trading app – and more controversial than its fans admit. This lesson covers both the toolkit and its limits.

What technical analysis aims to do#

Technical analysis looks only at price history and trading volume. Balance sheets, earnings and business models play no role. Its basic assumptions:

1. All relevant information is already in the price.
2. Prices move in trends.
3. Market psychology – greed, fear, herd behaviour – repeats and leaves recognisable patterns.

The opposing approach is fundamental analysis, which derives a company’s value from its numbers, as covered in Module 4.

Reading charts#

Line, bar and candlestick charts#

A line chart connects closing prices. A candlestick chart shows four values for each period: open, high, low and close. The thick body spans open to close; the thin wicks show the high and low. Try how the shape changes:

Candlesticks originated in 18th-century Japanese rice trading. They show at a glance whether buyers or sellers dominated a session and how hard the battle was.

Trends, support and resistance#

• Trend: an uptrend consists of rising highs and rising lows; a downtrend of falling ones.
• Support: a price level where buyers appeared in the past and stopped declines.
• Resistance: a level where sellers halted advances. When resistance is overcome, chartists call it a breakout.

Moving averages#

A moving average smooths the price by averaging, say, the last 50 or 200 closes. Many treat the 200-day average as the line between bull and bear territory. When the 50-day crosses above the 200-day, chartists call it a “golden cross”; below, a “death cross”.

Indicators#

There are hundreds of calculated indicators. The best known is the RSI (Relative Strength Index), which measures on a 0–100 scale how strong recent gains were relative to losses. Readings above 70 are called “overbought”, below 30 “oversold”. Volume matters too: moves on heavy volume are considered more meaningful.

What research says#

The key question isn’t whether patterns exist – our brains find patterns in any random sequence – but whether you can reliably make money from them after costs.

There’s also the problem of the self-fulfilling prophecy: if many traders see support at $100 and buy there, support holds – not because of a deeper law, but because everyone is watching. Once behaviour changes, the effect vanishes.

Where charts are still useful#

Technical analysis isn’t voodoo, but it isn’t a route to sure profits either. Used sensibly, it helps:

• understand price history: how volatile has a stock been, how deep were past drawdowns?
• gauge sentiment: a market far above its 200-day average with extreme RSI readings is euphoric.
• manage risk: traders can place sensible stops at clear price levels.
• plan entries: even fundamental investors use charts to avoid buying into the middle of a panic or a frenzy.

Summary#

Technical analysis reads trends, support, resistance and indicator signals from price and volume. Candlestick charts show at a glance who controlled a session. Research supports a few effects such as momentum but finds no reliable edge for most classic patterns after costs. As a tool for understanding and risk management, charts are useful – as a prediction machine, they are not.