What profitability and health measures are

This is a group of ratios assessing how efficiently a company generates profit and whether its finances are healthy. If valuation measures ask whether the stock is expensive or cheap, this group asks whether the business itself is good or weak.

The main measures

  • Return on equity (ROE): net profit divided by shareholders' equity. It shows how much profit the company generates per unit of shareholders' capital.
  • Return on assets (ROA): net profit divided by total assets. It shows how efficiently the company uses all its assets to generate profit.
  • Profit margin: the percentage of profit remaining per unit of revenue, showing how much the company keeps after costs.
  • Debt-to-equity ratio (D/E): total debt divided by shareholders' equity. It shows how much the company relies on debt — its financial leverage and the accompanying risk.

How to apply it

Use this group to assess business quality, separate from whether the stock is expensive or cheap. A company can have a cheap stock but weak fundamentals, or an expensive stock but high quality. Compare these ratios within the same industry, since reasonable levels differ across industries. Watch the debt level: high financial leverage amplifies both profit and risk.

A concrete example

Two companies both have an attractive return on equity. But one achieves it through real operating efficiency, while the other achieves it mainly by borrowing heavily to amplify. Also looking at debt-to-equity helps distinguish them: the low-debt company's profitability is usually more sustainable than one heavily dependent on leverage.

Common mistakes

  • Looking only at high profitability while ignoring the debt that produced it.
  • Comparing ratios across industries with very different characteristics.
  • Ignoring sustainability, trusting one good period without examining the trend.
  • Confusing a good business with a good stock; a good company can still be overpriced.

FAQ

  • Is high ROE always good? Not quite. ROE high from large debt carries hidden risk; view it alongside debt-to-equity to understand the source.
  • Is high debt always bad? Not necessarily; reasonable debt can support growth. The question is whether the debt level is sustainable relative to the ability to repay.
  • Can I just buy a good business? No. A good business at too high a price can still be a poor investment; combine with valuation measures.

Checklist

  • ☐ Does this profitability come from real efficiency or mainly from borrowing?
  • ☐ Is the debt-to-equity ratio sustainable?
  • ☐ Am I comparing within the same industry?
  • ☐ Am I distinguishing a good business from a reasonably priced stock?