Chapter 3

Volume & Moving Averages

Price tells you what happened; volume tells you how much conviction was behind it, and moving averages smooth the jagged line into a readable trend. This chapter covers both, then introduces two momentum tools — RSI and MACD — at the level of what they mean, not how to trade them.

Sources: Golden Cross vs. Death Cross (Britannica Money), Relative Strength Index (Wikipedia)

In this chapter
  • What the volume bars beneath a chart measure, and how they confirm or cast doubt on a price move.
  • How a moving average smooths price, and the difference between a simple (SMA) and an exponential (EMA) moving average.
  • What a moving-average crossover is — including the "golden cross" and "death cross" — and a concept-only introduction to RSI and MACD as momentum context.

What volume is

Underneath most price charts sits a row of vertical bars: volume. Each bar counts how many shares (or contracts) changed hands during that period. A tall bar means heavy trading — lots of participants active; a short bar means a quiet period with few. Volume says nothing about direction on its own. It measures participation, not up or down.

That makes volume a companion to price rather than a signal by itself. The useful question is always: how much volume accompanied this particular price move?

Volume confirms and warns

The core idea is confirmation. A price move backed by high volume carries more weight, because many participants are behind it. A move on thin volume is more suspect — it may be a few trades nudging price rather than a genuine shift in the crowd's opinion.

So when price breaks above resistance on a surge of volume, that breakout is more convincing than the same break on quiet volume. When a strong uptrend continues but each new high comes on shrinking volume, that divergence is a gentle warning that fewer participants are still pushing — the move may be running out of fuel. A sudden volume spike often marks moments of unusual interest: a news event, a climax of buying or selling, or a decisive breakout.

A reliable habit: whenever you notice a breakout or a sharp move, glance down at the volume bar. Heavy volume adds credibility; light volume invites caution.

Moving averages: SMA vs EMA

A moving average smooths the jagged price line by averaging price over a set number of recent periods, then plotting that average as its own line. As each new period arrives, the oldest drops out of the window and the average "moves" forward — hence the name. The result filters out short-term noise and makes the underlying direction easier to see. A rising moving average signals a broadly rising market; a falling one, the opposite.

The number of periods is the length. A short average (say 20 periods) hugs price closely and reacts fast; a long one (say 200 periods) is slower and smoother, showing the bigger picture. The 50-period and 200-period averages are among the most widely watched.

Simple versus exponential

There are two common recipes. A simple moving average (SMA) weights every period in the window equally — a plain average. An exponential moving average (EMA) gives more weight to recent prices, so it reacts more sharply to the latest moves and turns faster than an SMA of the same length. Neither is "better": the SMA is steadier and less twitchy, while the EMA is more responsive but also more prone to false turns. Which you prefer depends on whether you value smoothness or speed.

Crossovers

Because a short average reacts faster than a long one, the two lines cross each other when momentum shifts. A crossover is simply one moving average moving through another, and it is a common way of flagging that the balance may be changing.

Two crossovers have famous names. A golden cross occurs when a shorter-term average (classically the 50-day) crosses above a longer-term average (classically the 200-day) — often read as a sign of strengthening upward momentum. A death cross is the reverse: the shorter average crosses below the longer one, read as a sign of weakening. The dramatic names should not be mistaken for certainty. Crossovers are lagging — they describe a shift that has already begun, because averages are built from past prices — and like every tool here they can mislead in choppy, sideways markets.

A moving average does not predict; it summarises. It tells you cleanly where price has been, which is often enough to see where the trend stands today. — Standard technical-analysis convention

Momentum context: RSI and MACD

Two more tools appear on almost every platform. We introduce them only as concepts — enough to know what they measure when you see them.

RSI (Relative Strength Index)

The RSI is a momentum oscillator that moves on a scale from 0 to 100, measuring the speed and size of recent price changes. By long-standing convention, readings above 70 are described as overbought (price has risen far and fast) and readings below 30 as oversold (fallen far and fast). Crucially, "overbought" does not mean "about to fall" — a strong trend can stay overbought for a long time. RSI is context, not a command.

MACD (Moving Average Convergence Divergence)

The MACD is built from moving averages themselves. It tracks the relationship between a shorter and a longer EMA to gauge momentum and trend direction, and it draws a second "signal" line whose crossings are watched much like the moving-average crossovers above. When the two MACD lines pull apart or converge, they describe momentum building or fading.

Both RSI and MACD are best used as supporting context that agrees or disagrees with what price, volume, and trend are already telling you — never as standalone answers. With these tools in hand, the final chapter turns to the shapes that price itself draws over time: the classic chart patterns.