Level 2 · lesson
Market Cap
The market's price tag for the whole company — not the price of one share.
Why it matters
It cures the single most common beginner illusion: that a low share price means 'cheap'.
In plain language
Market cap is share price multiplied by the number of shares — the market's valuation of the entire company. A $2 stock with five billion shares is a $10 billion company; a $2,000 stock with a million shares is a $2 billion one.
The share price alone tells you nothing about size or value. It's just how finely the cake happens to be sliced.
Size sets personality: giant companies tend to move steadily; small ones can double or halve — small means fragile as often as it means opportunity.
In real life
A perfume in a 30ml bottle isn't cheaper than the 100ml because the bottle price is lower. You're paying per what's inside — always check the size of the whole thing.
In the market
'It's only $3 a share, it can easily go to $30!' — that sentence asks a $10 billion company to become a $100 billion one. Possible; rarely 'easy'.
The common mistake
Buying 'cheap-looking' share prices. Cheap per share and cheap as a business are entirely different measurements.
“The share price is the slice. Market cap is the cake.”
Quick self-check
Stock A costs $5, stock B costs $500. Which company is bigger?
Reveal Theia’s answer ↓Theia’s answer ↑
Unknowable from prices alone — you need the share count. Share price × shares = the real size. The $5 one is often the bigger company, sliced thinner.
Education, not financial advice. Markets involve risk; nothing here is a recommendation to buy or sell anything.