Every number on a quote screen is a sentence about supply and demand.
What you will learn
Decode a full stock quote
Understand what an index measures
Read price, volume, and change meaningfully
Reading a candlestick
Reading a candlestick
Where price comes from
Where price comes from
Anatomy of a quote
A quote shows: last price, bid/ask, volume (shares traded), day range (high-low), 52-week range, market cap, and change (in absolute and % terms). Each number answers a question: price = where we are, volume = how much conviction, range = how far it's traveled.
What an index measures
An index is a basket that tracks a slice of the market. The S&P 500 tracks 500 large U.S. companies weighted by market cap; the Dow is price-weighted; the Nasdaq leans tech. An index is a thermometer, not an investment you can buy directly — you buy funds that track it.
💡 Why weighting matters
In a market-cap-weighted index, a 1% move in a $3T company moves the index far more than a 1% move in a $30B company. So the S&P 500 is dominated by its biggest members. Understanding weighting explains why 'the market is up' can hide most stocks being down.
Volume tells you conviction
Price tells you the level; volume tells you how many people cared. A price move on high volume is meaningful — real money changed hands. The same move on thin volume is suspect — easily reversed. Always read price with volume.
% change vs absolute change
'Stock A fell $5' means nothing without context. A $5 move on a $20 stock is −25%; on a $500 stock it's −1%. Always convert to percentage to compare across assets, and annualize for fair time comparisons.
💡 The 52-week range
A stock at $90 with a 52-week range of $50–$100 is near its high — likely in an uptrend and possibly extended. A stock at $55 with the same range is near its low. Position within the range tells you where price sits relative to a year of history.
❓ Quick check
Market-cap weighting means an index is most influenced by:
A) The cheapest stocks
B) The largest companies
C) The most volatile stocks
D) Equal shares of all members
Bigger market cap = bigger weight.
(Knowledge check — full exam is next)
Key takeaways
A quote is a snapshot of price, volume, and range
Indexes are weighted baskets; weighting shapes what they say
Read price with volume; always use % change for comparison
📝 Weekly Exam — pass with 80% to unlock next week
10 questions. Review the Deep Dive and courses before attempting.
1. Market cap is:
Market cap = shares × price = total market value.
2. The S&P 500 is weighted by:
Market-cap weighted.
3. A price move on high volume is generally:
High volume = broad participation.
4. A $5 drop on a $20 stock is a change of:
5/20 = 25%.
5. The 52-week range tells you:
It frames the current price in historical context.
6. An index is:
Index = basket of securities.
7. 'The market is up' can be misleading because:
A few megacaps can lift the index while most stocks fall.
8. To fairly compare performance across assets, use:
% change normalizes across price levels.
9. Volume measures:
Volume = quantity traded.
10. Bid/ask on a quote tells you:
Bid = buy price, ask = sell price.
Your score: —
🛠 Weekly Project
Read and interpret a full quote for one asset.
1
Pick one stock or crypto and pull its full quote.
2
Write down: last, bid/ask, volume, day range, 52-week range, market cap.
3
Convert today's change to a % and compare to a 1-month % change.
4
Write 3 sentences: what is this quote telling you about supply and demand?