65-Day Academy · Day 2 · Foundations
Market Cap — the Price of the Whole Business
Definition
Market capitalization = share price × total shares outstanding. It answers: "what does the market currently charge for 100% of this business?" A $50 stock is not "cheaper" than a $500 stock — if the $50 company has 10× the shares, both businesses cost the same. Price per share is nearly meaningless on its own; market cap is the number that matters.
Size categories
Large-cap: >$10B. Mid-cap: $2–10B. Small-cap: $300M–2B. Micro/nano below that. Size changes behavior: large-caps are heavily researched, so mispricings are rarer but crashes are rarer too. Small-caps are less-covered (more mispricing opportunity) but trade thinner, move more violently, and go bankrupt more often. Neither is "better" — they are different games with different rules.
The trillion-dollar illusion
A famous trap: "the company is worth $2T, it can't go much lower." Market cap is a snapshot price, not a safety certificate. NVIDIA, Meta, and PayPal have each lost 40–75% at trillion-ish or near-trillion scale. Size tells you about liquidity and coverage, not about downside.
What you'll practise
Company A: price $50, 2,000M shares. Company B: price $500, 100M shares. Which market cap is larger, and what is the difference in $B?
15 XP in the app · introductory
Sources
- Market CapitalizationInvestopedia
- Market Cap CategoriesInvestopedia
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All lessons are for educational purposes only and are not individualized financial advice, a recommendation, or a solicitation to buy or sell any security. Options involve substantial risk and are not suitable for every investor.