Prepared by A-J | Author brand: 盡職生活｜阿J的普通人理財筆記
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-15 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-15 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
Key point: Remember: individual stocks can lose principal. This page provides education and a research framework only, not stock picks or entry/exit signals.
Revenue shows sales scale
Revenue helps track business scale and demand, but rising revenue does not guarantee rising profits.
Gross margin shows basic unit economics
A falling gross margin can reflect higher costs, product-mix changes, or price competition. A rising margin also needs to be tested for sustainability.
Operating margin focuses on core operations
After operating expenses, operating margin helps show whether the core business is economically productive.
ROE needs debt context
High return on equity can reflect strong capital efficiency, but it can also be amplified by lower equity or higher leverage. It should not be read in isolation.
How to verify information
Start with company filings, exchange/regulatory sources, and primary disclosures before relying on media summaries or market commentary. When sources conflict, prioritize formal filings and primary sources.
Primary sources
General investing education only. Not a recommendation, trading instruction, or promise of returns.