Can Relative Strength Rise While Your Investment Loses Money?
Calculate relative strength by comparing a stock with a benchmark. Distinguish absolute returns, relative performance, and RSI, and align currency and dividend conventions.
Relative strength comparison examines whether a stock has been stronger than a benchmark index or another asset. A price-ratio approach divides the stock price by the benchmark price and compares the resulting path. Relative strength can rise simply because the stock falls less than the market, so distinguish it from absolute returns.
The name RS alone does not define the formula
A relative strength comparison based on a simple price ratio differs from an RS rating that scores stocks by return rankings. The RS inside RSI is a ratio of average gains to average losses, so it also compares different things. First check whether the tool uses a price ratio, a return difference, or a ranking score. A price ratio’s absolute value depends on price units and the index’s base level, so a value above 1 does not by itself mean superior performance. Usually, the focus is how the ratio has changed from a defined starting point.
Fix the benchmark to match the question
The appropriate benchmark differs depending on whether you are assessing strength against the whole market or the same industry. Switching afterward to an index that makes the result look good defeats the comparison’s purpose. Nor does a company’s overseas revenue automatically justify comparing its share price directly with one quoted in another currency. Decide whether to include the exchange-rate exposure the investor actually bears, and align the use of price returns or dividend-inclusive total returns. Assets with different trading calendars or closing times may reflect fresh information on only one side, so identify those timing differences.
Relative advantage and suitability as a holding are separate judgments
Rising relative strength describes improved performance against the selected benchmark. It does not establish earnings growth or undervaluation, nor does it mean a positive return relative to cash. Stocks that fell less during a market decline may be candidates for observation, but the risk budget for holding them requires a separate judgment. Show the stock’s absolute return, benchmark return, and percentage change in the ratio together for clarity. The simple difference between two returns and the percentage change in a price ratio use different formulas, so do not expect identical numbers. Also check that price-return comparisons use the same start and end dates.
Worked example
Hypothetical example: A stock falls from 100 won to 90 won while an index falls from 1,000 to 800. The stock fell 10% and the index 20%. The price ratio rose from 0.1 to 0.1125, a 12.5% increase in the relative-strength ratio. The return difference is 10 percentage points, a different value. Record all three observations together: the stock held up better in relative terms, but its holder still has a 10% price loss.
What to check
- Check whether the measure is a price ratio, return difference, or ranking score.
- Fix the benchmark and comparison period in advance.
- Align currency, dividend treatment, and closing-time conventions.
- Record relative strength alongside absolute returns.
Sources and primary materials
This is educational material about research methods. For an actual company decision, verify the filings and primary sources for the relevant period.