Indicators: MA, RSI, MACD, Bollinger

One reader opens a chart of EUR/USD at 1.0850 and sees four lines. The moving average is flat. The RSI is near 50. The MACD histogram is small. The Bollinger bands are narrow. This reader counts four tools and waits for all four to agree before acting. The other reader sees the same four lines and asks a different question: which arithmetic produced each line, and what would each line fail to show? The first reader collects agreement. The second reader measures the gap between what happened and what each line can report.

The first reader is not lazy. The mistake is structural. A moving average, a MACD and the middle Bollinger band are all built from past closing prices. In a quiet drift they will point the same way because they are made from the same numbers. Their agreement is repetition, not evidence. Adding an RSI reading does not add a fourth independent witness. It adds a fourth calculation on the same past. Four lines drawn from one history cannot tell four separate stories.

The second reader knows this and still uses all four. The difference is that the second reader can say what each line would have missed. A moving average would have missed a sharp reversal until the reversal had already changed the average. An RSI would have missed a slow grind upward because a slow grind keeps the RSI near the middle. A MACD would have missed a move that never gathered momentum. A Bollinger band would have missed a steady trend that never stretched far from its own average. Knowing those gaps is the skill. It is not about which indicator is best. It is about which arithmetic can react to which kind of price change.

A moving average adds up the last set number of closing prices and divides by that number. If you choose 20 periods, it adds the last 20 closes and divides by 20. That single figure becomes one point on the line. The next period, it drops the oldest close and adds the newest one. The line moves only when the new close differs from the one it replaced. A moving average cannot react to a price that has not yet closed. It cannot see an intraday spike that vanishes before the close. It cannot see a reversal until the reversal has already changed enough closes to shift the average.

An RSI compares the average size of recent gains with the average size of recent losses over a set number of periods, often 14. It turns that comparison into a number between 0 and 100. A reading of 55 means gains were slightly larger than losses over those 14 periods. It does not mean the price rose strongly. A slow rise of 30 pips can keep the RSI near 55 because each gain is small. A single large gain can push the RSI higher even if the total move is smaller. The RSI cannot see the size of the move in pips. It sees only the ratio of gains to losses.

A MACD subtracts one moving average from another, usually a 12-period from a 26-period. The result is a line. A second line, called the signal line, is a moving average of that first line. The histogram is the difference between the two. Because both original averages are built from past closes, the MACD is also built from past closes. It reacts when the shorter average pulls away from the longer one. That happens when recent closes change faster than older closes. A MACD cannot see a steady trend where both averages rise at the same pace. In that case the two averages stay close and the MACD stays small.

A Bollinger band takes a moving average and adds a measure of how spread out the recent closes are. That measure is called standard deviation. The upper band is the average plus a multiple of that spread, often two. The lower band is the average minus the same multiple. When closes are close together, the bands narrow. When closes are spread out, the bands widen. The middle band is just the moving average. A Bollinger band cannot see direction. It shows how far recent closes sit from their own average. A narrow band does not predict a breakout. It only says recent closes were close together.

Take one quiet stretch of EUR/USD with 40 pips of movement. The moving average is flat because the closes are similar. The MACD is small because the two averages are close. The middle Bollinger band is also flat for the same reason. The RSI sits near 50 because gains and losses are nearly equal. Four lines say the same thing. A reader who counts agreement sees four confirmations. A reader who knows the arithmetic sees one fact repeated four times. The four lines cannot tell you what will happen next. They can only tell you that the recent past was quiet.

Now suppose the price rises 25 pips while you hold 0.10 lots. At KSh 1,300 per pip on one standard lot, one pip is KSh 1,300 divided by 10, which is KSh 130. Then 25 pips times KSh 130 equals KSh 3,250. That figure comes from the pip value, not from any indicator. The conversion rate used for the pip value can change, so the figure can change. A broker may round the pip value, quote a different conversion rate, and charge a spread or commission on top. Those charges vary between brokers and change the figure. No line on the chart tells you those costs.

A 14-period RSI reads 55 after a slow 30-pip rise. Does that tell you the rise was strong? No. RSI compares recent gains with recent losses, and a slow rise keeps it near the middle. A reading of 55 says gains were slightly larger than losses, not that the rise was strong. The size of the move in pips is a separate figure. The same 30-pip rise could produce a different RSI if it happened in larger steps. The RSI cannot see the step size. It sees only the ratio of gains to losses. That gap is what you must supply from the price itself.