biology

Good 'til cancelled

Good 'til cancelled is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Good 'til cancelled rather than just read about it. In short: In investment, a good ’til cancelled (GTC) order is an order to buy or sell a security at a specified price which remains in effect until executed or cancelled by the investor. In other words, a GTC order will continue indefinitely until the specified parameters are met, whilst a normal day order would cancel automatically after the market closes, requiring the investor to make a new order the next day if desired.

Key takeaways

Good 'til cancelled belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Good 'til cancelled to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Good 'til cancelled from memory before moving on to harder problems.

Reference excerpt

In investment, a good ’til cancelled (GTC) order is an order to buy or sell a security at a specified price which remains in effect until executed or cancelled by the investor. In other words, a GTC order will continue indefinitely until the specified parameters are met, whilst a normal day order would cancel automatically after the market closes, requiring the investor to make a new order the next day if desired.

References

Worked examples

Example 1 — a first encounter with Good 'til cancelled

Start with the simplest possible case. Write down what Good 'til cancelled claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Good 'til cancelled before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Good 'til cancelled ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Good 'til cancelled

In research: Good 'til cancelled appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Good 'til cancelled in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Good 'til cancelled is common in secondary-school and first-year university syllabi. It links to neighbouring topics Finance stubs, Investment, so understanding it makes those chapters shorter.
In everyday life: Look for Good 'til cancelled outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Good 'til cancelled in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Good 'til cancelled means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Good 'til cancelled out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Good 'til cancelled in simple terms?

Why does Good 'til cancelled matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Good 'til cancelled?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Good 'til cancelled.