science

Neoclassical finance

Neoclassical finance 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 Neoclassical finance rather than just read about it. In short: Neoclassical finance is an approach within finance, developing since the mid-1960s, which holds that markets are efficient, and that prices will thus tend to equilibrium and be "rational"; and asset pricing models must then reflect these. It may be contrasted with, for example, behavioral finance which is based on differing, less idealized, assumptions regarding markets and investors.

Key takeaways

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

Reference excerpt

Neoclassical finance is an approach within finance, developing since the mid-1960s, which holds that markets are efficient, and that prices will thus tend to equilibrium and be "rational"; and asset pricing models must then reflect these. It may be contrasted with, for example, behavioral finance which is based on differing, less idealized, assumptions regarding markets and investors. It built on earlier developments such as the Austrian School of economics, and cross-fertilized with atomic physics (see state price) and other heavily quantitative disciplines.

See also Financial economics and particularly, #Arbitrage-free pricing and equilibrium Neoclassical economics Fundamental theorem of asset pricing Modern portfolio theory Post-modern portfolio theory Stephen Ross

References

Neoclassical Finance; Stephen A. Ross at press.princeton.edu

Worked examples

Example 1 — a first encounter with Neoclassical finance

Start with the simplest possible case. Write down what Neoclassical finance 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 Neoclassical finance 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 Neoclassical finance 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 Neoclassical finance

In research: Neoclassical finance 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 Neoclassical finance 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: Neoclassical finance is common in secondary-school and first-year university syllabi. It links to neighbouring topics Finance stubs, Financial economics, so understanding it makes those chapters shorter.
In everyday life: Look for Neoclassical finance 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 Neoclassical finance in 20 minutes

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

Frequently asked questions

What is Neoclassical finance in simple terms?

Why does Neoclassical finance 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 Neoclassical finance?

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 Neoclassical finance.