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Knowledge and Decisions

Knowledge and Decisions 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 Knowledge and Decisions rather than just read about it. In short: Knowledge and Decisions is a non-fiction book by American economist Thomas Sowell. The book was initially published in 1980 by Basic Books and reissued in 1996.

Knowledge and Decisions — main illustration
Knowledge and Decisions — illustration

Key takeaways

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

Reference excerpt

Knowledge and Decisions is a non-fiction book by American economist Thomas Sowell. The book was initially published in 1980 by Basic Books and reissued in 1996. Sowell analyzes social and economic knowledge and how it is transmitted through society, and how that transmission affects decision making. The book's central theme of dispersed knowledge is drawn from F.A. Hayek's article "The Use of Knowledge in Society." Hayek said that this book expanded admirably on his original concepts and made them clear to lay readers, with examples of economic activity drawn from the real world. Sowell rejects the tendency to put economic and political decisions and their results in moral terms. Doing so, he argues, ignores the tradeoffs and limitations inherent in every economic system and society. Consistent with his established laissez-faire viewpoints, Sowell also indicts price controls (such as rent control, minimum wage, price fixing, and subsidies) as interfering in the implicit communication between consumers and producers necessary to optimize the choices of each. The fact that some industries or government agencies seem particularly incompetent or corrupt over many turnovers of their staff, he argues, is not bad people performing the duties, but of rational people acting in their own interests responding to whatever incentives have been established in the system. The last section of the book deals with intellectuals, those whose profession is the distribution of ideas. Sowell questions the popular unwavering faith in the expert intellectual and "articulated rationality" for "solutions" to economic or political problems. He explains that through intellectuals, government agencies, such as the United States Environmental Protection Agency and National Institutes of Health, have become more numerous and more powerful. Sowell explains that agencies make more laws than Congress does, but the agencies are insulated from any sort of consequences of their decisions because the officials are not elected. That has the effect of creating a larger divide between people who make decisions and those who experience the consequences. Sowell also talks about the recurrent unintended consequences of many intellectual decisions. Consequently, Sowell advocates decentralized decision making by allowing people to make economic choices for themselves rather than assuming that non-elected intellectuals at centralized planning agencies will make better decisions.

See also Adam Smith Government agency Information Rules (book) Supply and demand

References

Worked examples

Example 1 — a first encounter with Knowledge and Decisions

Start with the simplest possible case. Write down what Knowledge and Decisions 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 Knowledge and Decisions 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 Knowledge and Decisions 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 Knowledge and Decisions

In research
Knowledge and Decisions 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 Knowledge and Decisions 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
Knowledge and Decisions is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1980 non-fiction books, Basic Books books, Books by Thomas Sowell, so understanding it makes those chapters shorter.
In everyday life
Look for Knowledge and Decisions 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 Knowledge and Decisions in 20 minutes

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

Frequently asked questions

What is Knowledge and Decisions in simple terms?

Knowledge and Decisions is a non-fiction book by American economist Thomas Sowell. The book was initially published in 1980 by Basic Books and reissued in 1996.

Why does Knowledge and Decisions 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 Knowledge and Decisions?

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 Knowledge and Decisions.

Tags

  • 1980 non-fiction books
  • Basic Books books
  • Books by Thomas Sowell
  • Economics and finance book stubs
  • Economics books
  • Works about the information economy

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