Definitions of economics: wealth, welfare, scarcity and growth

1. Wealth definition (the classical view)

The classical economists treated economics as the science of wealth. Adam Smith called his book An Inquiry into the Nature and Causes of the Wealth of Nations (1776), and economics became the study of how a nation’s wealth is produced and increased. J.B. Say described it as “the science which treats of wealth”, and J.S. Mill as the science of the production and distribution of wealth. F.A. Walker defined it as “that body of knowledge which relates to wealth”.

Features.

• Wealth is the central subject: its production, exchange, distribution and consumption.
• The idea of the economic man, who acts only from self-interest to acquire wealth.
• Wealth meant material goods only; services were left out.
• Smith’s practical aim was to show how nations grow rich, through division of labour and free trade.

Criticism. Carlyle and Ruskin called economics a “dismal science” and a “gospel of Mammon” because it seemed to put wealth above man. The definition gives primary place to wealth and a secondary place to man; it ignores services (the work of a doctor or a teacher); the economic man is an abstraction, since real people act from love, duty and patriotism as well; and it says nothing about human welfare, which is the real purpose of wealth.

2. Welfare definition (Marshall and the neo-classicals)

Alfred Marshall, in Principles of Economics (1890), shifted the emphasis from wealth to man: “Political Economy or Economics is a study of mankind in the ordinary business of life; it examines that part of individual and social action which is most closely connected with the attainment and with the use of the material requisites of well-being.” Economics is “on the one side a study of wealth; and on the other, and more important side, a part of the study of man.” Pigou, Cannan and Beveridge followed this approach. Pigou defined economic welfare as that part of social welfare that can be brought into relation with the measuring rod of money.

Features.

• Primacy of man: wealth is a means; human welfare is the end.
• Ordinary business of life: economics studies people as they earn and spend in daily life, not saints or misers.
• Material welfare only: the concern is with the material requisites of well-being (food, clothing, shelter), not with spiritual or moral welfare.
• Social science: it studies people living in society, not isolated individuals.
• Measurability: only activities that can be measured in money are included.

Criticism (Robbins). (a) The line between material and non-material is arbitrary: the services of a singer or a lawyer satisfy wants and command a price, yet are not material. (b) Welfare is subjective and cannot be measured; the same good gives different welfare to different people. (c) Many economic activities do not promote welfare at all, such as the production of liquor or weapons, yet economics must study them. (d) Linking economics to welfare makes it a normative science, whereas Robbins wanted it to be neutral between ends. (e) The definition is classificatory rather than analytical.

3. Scarcity definition (Robbins)

Lionel Robbins, in An Essay on the Nature and Significance of Economic Science (1932), defined economics as “the science which studies human behaviour as a relationship between ends and scarce means which have alternative uses.”

The four elements.

1. Unlimited ends. Human wants are unlimited; as one is satisfied another arises.
2. Scarce means. The resources to satisfy wants (time, money, land, labour) are limited relative to wants.
3. Alternative uses. Each resource can be put to several uses: land may grow rice or sugarcane, an hour may be spent working or resting.
4. Ends of varying importance. Wants differ in urgency, so they can be ranked, and choice becomes possible.

Together these produce the economic problem: the problem of choice. Every economic decision is a decision about how to allocate scarce means among competing ends.

Merits. The definition is analytical and universal: it applies to a Robinson Crusoe, a socialist planner and a capitalist firm alike. It brings non-material services within economics, it makes economics a positive science that is neutral between ends, and it identifies scarcity and choice as the root of all economic activity.

Criticism.

• It makes economics a pure science of choice and strips out welfare, so economists cannot advise on policy. Most economists accept that economics should also say what ought to be done.
• It ignores problems of abundance: in the Great Depression of the 1930s the problem was unused resources and unemployment, not scarcity. Keynes’ General Theory (1936) dealt with exactly that.
• It is static and says nothing about economic growth, how the quantity of resources increases over time.
• It is too wide (every choice, even religious or political, involves scarce means) and yet too narrow (it leaves out macro problems of national income and employment).

4. Growth-oriented definition (Samuelson)

Paul Samuelson combined scarcity with growth: “Economics is the study of how men and society end up choosing, with or without the use of money, to employ scarce productive resources which could have alternative uses, to produce various commodities over time and distributing them for consumption, now and in the future, among various people and groups in society.”

Features. It keeps Robbins’ elements of scarcity and choice; it is dynamic, because it speaks of production “over time” and consumption “now and in the future”, bringing in growth; it covers the production, distribution and consumption problems together; “with or without the use of money” extends it to barter economies; and it covers both micro and macro questions. It is the most comprehensive of the four, though critics say it is too wide and still does not give welfare its place.

5. Comparison at a glance

6. Nature and scope of economics

Nature: science or art? Economics is a science because it is a systematised body of knowledge that traces cause and effect (for example, a rise in price reduces demand). It is both a positive science (what is) and a normative science (what ought to be): Robbins treated it as positive only, Marshall and Pigou as normative too. It is also an art, because it applies that knowledge to practical problems such as poverty, inflation and taxation. It is a social science, and its laws are less exact than those of physics.

Scope covers (a) subject-matter: consumption, production, exchange, distribution and public finance; (b) micro economics (the individual consumer, firm and industry) and macro economics (national income, employment, the price level, growth); and (c) the study of different economic systems.

How this is examined

One of the definitions appears in almost every paper. The January 2026 100-mark paper asked to “Explain the wealth and welfare definition of economics” (16 marks), and the January 2026 80-mark paper to “Critically explain wealth definition of economics”, with a note on the scope of economics. The June 2025 papers asked to “Critically examine scarcity definition”, “Explain the nature and scope of Economics” and “Critically examine the welfare definition”. In a critical question, quote the definition, list its features, give the criticism and end by naming the definition that replaced it.