The Life Starter
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Course Library · Lesson 1 of 6
Money · Guided lesson

Read a quote and the bid–ask spread

About 12 minutes · 4 reading + 8 practice and checks
Time includes reading, practice, and questions. Extra videos or further study are optional.
See this course’s project requirements

A fictional stock-literacy file with a quote card, checked order and gap cases, an accessible OHLC chart, a pattern counterexample and a reconciled paper-trade ledger.

Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.

What to include

  • A quote card with exact symbol, historical last price, best bid, best ask, spread, visible sizes and simulation limitations.
  • An order comparison showing executed quantity, unfilled quantity, gross cost, weighted fill price, fee and total cash cost.
  • A two-column gap comparison with trigger, resulting instruction, fill status, executed price, net cash and unsold shares.
  • An annotated original candle chart, exact matching data table and period-3 range/body/wick calculation.
  • A pattern note with numerical definitions, $49 three-period average, opposing continuations and a failed observed-support band.
  • A complete fictional stock-literacy file with quote card, order/gap comparisons, accessible OHLC chart, pattern counterexample and reconciled two-order ledger.

Review and revise

Use these criteria to check your work and choose what to improve.

  • Quote, order and ledger records use the exact supplied inputs, distinguish submitted/pending/filled states and reconcile all executed quantities.
  • Money calculations show units, fees and intermediate steps; cash and shares agree with an independent calculation.
  • The original chart has a matching table and labels; pattern notes retain contrary evidence and distinguish historical observations from forecasts.
  • All six lesson outputs and changed-input results are included, with fictional assumptions and untested real-world behavior stated accurately.
Open the full course project
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Before you begin

The idea in everyday life

PINE-PRACTICE is an invented company symbol, not a real security. The fictional last-traded price is $50.00. The book has buyers for 6 shares at $50.00 and 4 at $49.80; sellers offer 6 shares at $50.20 and 4 at $50.40. Use those quotes exactly, with no other traders or changing prices. A fictional fee of $1 is charged once per order with any fill; no fee is charged when nothing fills. This static exercise omits routing, queue priority, tax, latency, price improvement, market halts and brokerage-specific rules.

The idea

A quote records offered prices and quantities at one moment. A past transaction does not promise the price of the next transaction.

Follow along

Read a quote and the bid–ask spread — worked paper practice

A quote records offered prices and quantities at one moment. A past transaction does not promise the price of the next transaction.

PINE-PRACTICE is an invented company symbol, not a real security. The fictional last-traded price is $50.00. The book has buyers for 6 shares at $50.00 and 4 at $49.80; sellers offer 6 shares at $50.20 and 4 at $50.40. Use those quotes exactly, with no other traders or changing prices. A fictional fee of $1 is charged once per order with any fill; no fee is charged when nothing fills. This static exercise omits routing, queue priority, tax, latency, price improvement, market halts and brokerage-specific rules.

Fictional PINE-PRACTICE quote book

Paste at A1.

ASideBPrice ($/share)CAvailable shares
Bid506
Bid49.84
Ask50.26
Ask50.44

Copy as plain text

  1. 1. Identify the record

    Copy PINE-PRACTICE, Practice snapshot A, dollars/share and last trade $50.00.

    You should see: The last price is labeled historical; no real ticker or timestamp is implied.

    Different records or times should not be silently mixed.

  2. 2. Match the sides

    For a hypothetical buyer, identify sellers’ asks. For a hypothetical seller, identify buyers’ bids.

    You should see: Buy meets ask; sell meets bid in this supplied model.

    Do not reverse whose interest the price describes.

  3. 3. Measure the spread

    Subtract the highest bid from the lowest ask.

    50.20 - 50.00 = 0.20

    You should see: $0.20 per share.

    Spread is a difference between two quoted prices, not a guaranteed fee schedule.

  4. 4. Read the size

    Find the quantity at the best ask and the next ask.

    You should see: 6 at $50.20; 4 at $50.40.

    The quoted price and available quantity belong together.

  5. 5. Limit the conclusion

    Record one reason these quotes cannot establish a real future execution price.

    You should see: Other orders, changed quotes, latency or a halt could change actual execution.

    Learning a record is different from predicting a market.

Now change one thing

Change only the best ask to $50.35; keep best bid $50.00. Enter the spread in dollars per share without the dollar sign.

Your work

What to finish

A quote card with exact symbol, historical last price, best bid, best ask, spread, visible sizes and simulation limitations.

Common mistake

Watch for this

Assuming that a displayed last price is a price at which every requested share can be bought.

How can I tell I understand it?

Explain which side a buyer or seller meets and reproduce the spread after one quote changes.

Try 3 questions

Quick knowledge check

Answer all 3 questions. Get at least 2 right and the lesson completes automatically.

Not yet passed

You’ll get an explanation for each answer. Signed in? Your results save to your account.

1The last trade was $50.00, but snapshot A’s lowest ask is $50.20. What should a paper buyer conclude?
2A changed snapshot has best bid $24.80 and best ask $25.05. What is the spread?
3Snapshot A offers 6 shares at $50.20 and 4 at $50.40. What information is missing from a claim that 10 shares are available at $50.20?
0 of 3 answeredApply the lesson to a short question, then review the explanation.
1
Finish this lesson

Pass the check. We’ll save the progress.

Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.

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Tools, templates, and lesson sources

Tools and templates

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Sources and further reading

Explore the references behind this lesson.

SEC Investor.gov — Stock Quotes
Source & access notes · checked 2026-10-01

Inspected distinction between current bid/offer quotes and historical OHLC/volume records.

Access: Public official page inspected with the web reader on 2026-10-01; no broker tools or real transactions operated.

Reuse: Concept references only. All prices, records, charts, worked examples, exercises and questions are original fictional LifeStarter material; no source diagram or exercise copied.

SEC Investor.gov — Bid Price/Ask Price
Source & access notes · checked 2026-10-01

Inspected bid, ask and spread definitions; all quote sizes and prices in this course are invented.

Access: Public official page inspected with the web reader on 2026-10-01; no broker tools or real transactions operated.

Reuse: Concept references only. All prices, records, charts, worked examples, exercises and questions are original fictional LifeStarter material; no source diagram or exercise copied.

SEC Investor.gov — Understanding Order Types
Source & access notes · checked 2026-10-01

Inspected market/limit, partial execution, stop triggers and stop-limit nonexecution; specific policies vary by broker.

Access: Public official page inspected with the web reader on 2026-10-01; no broker tools or real transactions operated.

Reuse: Concept references only. All prices, records, charts, worked examples, exercises and questions are original fictional LifeStarter material; no source diagram or exercise copied.

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