science

Gordon-Schaefer model

Gordon-Schaefer model is a science 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 Gordon-Schaefer model rather than just read about it. In short: The Gordon-Schaefer model is a bioeconomic model applied in the fishing industry. It may be used to compute the maximum sustainable yield.

Key takeaways

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

Reference excerpt

The Gordon-Schaefer model is a bioeconomic model applied in the fishing industry. It may be used to compute the maximum sustainable yield. It takes account of biological growth rates, carrying capacity, and total and marginal costs and revenues. This model can be applied in three primary scenarios: Monopoly; Maximum Sustainable Yield (biological optimum); and Open Access.

Monopoly Profit maximizing firms, whether in monopoly or competitive markets, increase production to the point that marginal revenue = marginal costs. Monopoly firms produce less at higher prices than competitive markets.

Maximum sustainable yield The maximum sustainable yield (MSY) is the largest amount of biomass that can be collected annually for indefinite periods. MSY assesses the productive capacity of the fishery, rather than demand or economic costs. MSY output may be greater or less than monopolistic or competitive output.

Open access Open access is an unrestricted market. In open access, production in a given year is limited by demand and the costs of production without regard to that year's effects on future years. Open access markets can be competitive or monopolistic.

References

Munro, Gordon R. (August 1979). "The Optimal Management of Transboundary Renewable Resources". The Canadian Journal of Economics. 12 (3). Blackwell Publishing on behalf of the Canadian Economics Association: 355–376. doi:10.2307/134727. JSTOR 134727. Shah, M. A.; Sharma, U. (2003). "Optimal harvesting policies for a generalized Gordon–Schaefer model in randomly varying environment". Applied Stochastic Models in Business and Industry. 19: 43–49. doi:10.1002/asmb.490. Bioeconomía pesquera: teoría, modelación y manejo Por J. C. Seijo, Food and Agriculture Organization of the United Nations

Worked examples

Example 1 — a first encounter with Gordon-Schaefer model

Start with the simplest possible case. Write down what Gordon-Schaefer model claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Gordon-Schaefer model 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 Gordon-Schaefer model 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 Gordon-Schaefer model

In research: Gordon-Schaefer model appears in science 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 Gordon-Schaefer model 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: Gordon-Schaefer model is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fisheries science, Resource economics, Sustainable fishery, so understanding it makes those chapters shorter.
In everyday life: Look for Gordon-Schaefer model 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 Gordon-Schaefer model in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gordon-Schaefer model 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 Gordon-Schaefer model out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gordon-Schaefer model in simple terms?

The Gordon-Schaefer model is a bioeconomic model applied in the fishing industry. It may be used to compute the maximum sustainable yield.

Why does Gordon-Schaefer model matter?

Because it connects several science 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 Gordon-Schaefer model?

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 Gordon-Schaefer model.