Updated for the 2026-2027 CFA® Level I curriculum.
A single ratio rarely tells you much on its own. A rising return on assets could mean a company is getting more efficient, or it could be masking a liquidity problem building underneath. CFA Level I tests whether you can read ratios together and use that combined picture to evaluate a company, not whether you can calculate ratios one at a time.
Quick Answer
Ratios should be interpreted together, not in isolation, because one ratio often explains or offsets another. Evaluating a company requires both trend analysis (comparing a company's ratios across time) and cross-sectional analysis (comparing a company to peers or an industry benchmark). A ratio that looks strong alone can signal weakness once you check it against a related ratio or against the right comparison group.
Key Takeaways
Ratios are interconnected. A change in one ratio often has a direct cause or consequence reflected in another.
Trend analysis shows whether a company's ratios are improving or deteriorating over time.
Cross-sectional analysis shows how a company's ratios compare to peers or an industry average at a single point in time.
A complete evaluation combines both time-series and cross-sectional comparisons, not just one.
Industry and business model differences must be considered before comparing ratios across companies.
An improving profitability ratio does not guarantee overall financial health if liquidity or leverage ratios are moving the wrong direction.
What You Need to Know for CFA Level I
The LOS asks you to describe relationships among ratios and evaluate a company using ratio analysis, so expect interpretation questions, not just calculation questions.
Focus on how ratios from different categories (profitability, liquidity, activity, solvency) interact to tell a combined story about financial condition.
You need to compare a company's ratios both to its own history (trend analysis) and to peers or industry norms (cross-sectional analysis).
This note does not cover the specific three- or five-way breakdown of return on equity. That belongs to DuPont Analysis of Return on Equity.
The most common trap is treating one strong or weak ratio as the full answer instead of checking what related ratios show.
Ratios Do Not Work in Isolation
Each ratio captures one slice of financial performance. Profitability ratios show how much a company earns. Liquidity ratios show whether it can meet short-term obligations. Activity ratios show how efficiently it uses assets. Solvency ratios show how much debt it carries relative to equity or earnings. None of these slices is complete by itself.
Why Ratios Move Together
Many ratios share inputs or are mathematically linked. Net income appears in profitability ratios, but it also flows into retained earnings, which affects the equity side of solvency ratios. Sales appears in both profitability ratios (profit margin) and activity ratios (asset turnover). When one number in the financial statements changes, it often moves more than one ratio at the same time, sometimes in opposite directions.
A classic example: return on assets (ROA) combines a profitability ratio and an activity ratio.
where:
Net Income: profit after all expenses and taxes,
Revenue: total sales for the period, and
Average total assets: .
This shows that ROA can rise because margins improved, because asset efficiency improved, or both. Two companies can report the same ROA for completely different reasons. You cannot evaluate ROA correctly without checking which driver moved.
Reading Ratio Categories Together
If this ratio moves... | Check this related ratio | Why it matters |
|---|---|---|
Profitability improves | Liquidity ratios | Rising profit does not guarantee enough cash or current assets to cover near-term obligations |
Activity ratios slow down (turnover falls) | Profitability ratios | Slower asset use can still produce stable profit if margins widen, masking an efficiency problem |
Solvency ratios rise (more leverage) | Liquidity ratios | Higher debt combined with weaker liquidity signals rising financial risk, even if profits look fine |
Current ratio improves | Composition of current assets | A current ratio can improve because of a buildup in slow-moving inventory rather than cash |
This table is a reasoning tool, not a memorized rule. The exam rewards candidates who can explain why two ratios moving in different directions changes the overall conclusion.
Evaluating a Company: Trend and Cross-Sectional Analysis
Company evaluation under this LOS relies on two comparison methods used together.
Trend (Time-Series) Analysis
Trend analysis compares a company's own ratios across multiple periods. It answers: is this company improving or weakening over time? A single year of data cannot answer this question. You need at least two periods, and ideally more, to separate a real trend from normal year-to-year noise.
Cross-Sectional Analysis
Cross-sectional analysis compares a company's ratios to peers or an industry average at the same point in time. It answers: how does this company compare to others doing the same kind of business? A ratio that looks weak in isolation might be normal for the industry. A ratio that looks strong might still lag behind competitors.
Why Context Matters
Comparing ratios across companies only works if the companies are reasonably similar. A capital-intensive manufacturer will naturally have lower asset turnover than a retailer. A heavily leveraged utility will carry higher debt ratios than a software company with few fixed assets. Before concluding that a company is underperforming or outperforming, confirm the comparison group matches its industry and business model.
Working Example
Scenario: Brightline Tools Inc. reports the following figures for two consecutive years.
Item | Year 1 | Year 2 |
|---|---|---|
Net income | $50 million | $60 million |
Revenue | $500 million | $520 million |
Average total assets | $400 million | $460 million |
Current assets | $120 million | $110 million |
Current liabilities | $100 million | $115 million |
Total debt | $150 million | $190 million |
Total equity | $200 million | $210 million |
Industry averages for Year 2: ROA 10%, current ratio 1.30, debt-to-equity 0.60.
Step 1: Calculate profitability and activity ratios.
Step 2: Calculate liquidity and solvency ratios.
Step 3: Interpret the relationships.
ROA rose from 12.5% to 13.0%, and the improvement came mostly from a wider profit margin, since asset turnover actually slowed. Looking at ROA alone, Brightline appears healthier.
But the current ratio fell below 1.0, meaning current liabilities now exceed current assets. Debt-to-equity rose at the same time. Read together, these three ratios tell a different story: profitability is improving, but total debt is rising while the liquidity cushion shrinks. The data do not split short-term and long-term borrowing or identify exactly how the additional borrowing was used.
Step 4: Add cross-sectional context.
Compared to the industry, Brightline's Year 2 ROA (13.0%) beats the 10% average, but its current ratio (0.96) sits well below the 1.30 average, and its debt-to-equity (0.90) runs higher than the 0.60 average.
Brightline is more profitable than its peers, but it carries more financial risk than its peers and less short-term cushion. An analyst relying only on ROA would miss this. The correct evaluation requires reading profitability, liquidity, and solvency ratios together, then checking all three against industry norms.
Common Exam Traps
Treating one improving ratio as the full picture
A rising ROA, ROE, or margin does not mean overall financial health improved if liquidity or leverage ratios are moving the wrong direction at the same time.
Confusing this LOS with DuPont analysis
This page covers general relationships across ratio categories. DuPont analysis is a specific decomposition of ROE into margin, turnover, and leverage components. Know which note owns which calculation.
Using only trend analysis or only cross-sectional analysis
A complete evaluation checks a company against its own history and against peers. Relying on just one method produces an incomplete conclusion.
Comparing ratios across companies with different business models without adjustment
A low asset turnover ratio is normal for a capital-intensive business and would be a red flag for a retailer. Context changes the correct interpretation.
Ignoring the composition behind a ratio
A current ratio can rise because of a genuine liquidity improvement or because slow-moving inventory built up. The number alone does not tell you which one happened.
Practice Question
An analyst reviews a manufacturing company and finds that its return on assets increased from 9% to 11% over the past year. Over the same period, the company's current ratio fell from 1.40 to 1.05, and its debt-to-equity ratio rose from 0.50 to 0.80. Which conclusion is most appropriate?
The company's overall financial condition improved because return on assets increased.
The company became more profitable, but declining liquidity and rising leverage suggest increasing financial risk.
The ratios are independent of each other, so no combined conclusion can be drawn.
Correct Answer: B
Return on assets improved, which reflects stronger profitability or asset efficiency. However, the falling current ratio and rising debt-to-equity ratio both point to greater financial risk. Evaluating the company requires reading all three ratios together rather than relying on the improving ROA alone.
Option A: This treats ROA as a complete measure of financial health and ignores the liquidity and leverage signals moving in the opposite direction.
Option C: This contradicts the core idea of the LOS. Ratios are connected through shared financial statement inputs and should be interpreted together, not treated as unrelated.
Continue Your CFA Level I Prep With KeyPoint
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FAQs About Relationships Among Ratios and Company Evaluation
Is this the same thing as DuPont analysis?
No. DuPont analysis is a specific formula that breaks return on equity into profit margin, asset turnover, and financial leverage. This note covers the broader skill of reading relationships across all ratio categories and using both trend and peer comparison to evaluate a company.
Should I compare a company to its past performance or to its industry?
Both. Trend analysis shows direction over time. Cross-sectional analysis shows relative standing against peers. A full evaluation uses both methods together.
Can a company look financially strong based on one ratio but actually be at risk?
Yes. A strong profitability ratio can exist alongside weakening liquidity or rising leverage. The exam tests whether you catch this by checking related ratios, not just the one that looks favorable.
Why does industry matter when comparing ratios?
Business models differ. Capital-intensive industries naturally show lower asset turnover and higher leverage than service-based industries. Comparing a company only to a generic benchmark, instead of its actual peer group, can produce a misleading conclusion.
Does the Level I exam expect memorized ratio relationships?
No. The exam expects you to reason through how one ratio affects or explains another using the data given in a scenario, not to recall a fixed list of relationships.