Common Indicators: Moving Averages and Relative Strength Index

Technical indicators are mathematical transformations of price (and sometimes volume) that are meant to highlight trends or identify overbought/oversold conditions. No indicator is predictive on its own; they are best used in combination with price action and volume.

Moving Averages

A moving average smooths price data over a window of days (a 20-day moving average is the average of the last 20 days' closes). Faster moving averages (like 10-day or 20-day) hug the price closely and change direction frequently; slower moving averages (like 50-day or 200-day) filter out noise and highlight long-term trends. Traders use moving averages to identify trend direction: if price is above the 200-day, the long-term trend is up. When a fast moving average crosses above a slow one, it's often called a 'golden cross' and is treated as a bullish signal; the opposite is a 'death cross.'

Relative Strength Index (RSI)

RSI compares the magnitude of recent up moves to recent down moves and produces a number between 0 and 100. An RSI above 70 is often called overbought (suggesting buyers have pushed too hard and a pullback might be coming). An RSI below 30 is oversold (suggesting sellers have pushed too hard). But overbought/oversold readings don't mean price will reverse immediately—in a strong uptrend, RSI can stay above 70 for weeks. The most reliable RSI signals often come from divergences: when price makes a new high but RSI doesn't, suggesting the upward momentum is weakening.

The trap many technical traders fall into is over-trusting indicators. An indicator is only as good as its underlying logic. A moving average is just yesterday's average; it will always lag the turning point. RSI measures past momentum; past momentum doesn't guarantee future momentum. Indicators are useful when combined with price action (where are the support and resistance levels?), volume (are buyers/sellers actually engaged?), and context (what is the overall market doing?).

• Indicators summarize the past; they don't predict the future.
• The best signals come from combining multiple perspectives.
• An indicator that works in a trending market often fails in a sideways market.
• Never trade an indicator alone; always confirm with price and volume.