History of Economic Thought – Comprehensive Notes

1.5 A History of Economic Thought – Learning Objectives

  • After studying this section you should be able to:
    • Define every technical term appearing in bold in the text.
    • Explain the major schools of thought from the 18th C → 21st C:
    • 18th C: Adam Smith & laissez faire.
    • 19th C: Utilitarianism & classical micro-/macro-economics; the concept of the margin; Say’s Law; the Marxist critique.
    • 20th C: Keynesian revolution, birth of macro-policy; monetarist/neo-classical counter-revolution.
    • 21st C: Behavioural economics; awareness of economy–society–environment interdependence; move toward a circular economy.
  • Appreciate how past ideas remain embedded in modern economic analysis.

18th Century – Adam Smith & Laissez Faire

  • Context
    • Until the late 1700s “economics” was part of “moral philosophy.”
    • Adam Smith (1723-1790), Scottish moral philosopher; author of An Inquiry into the Nature and Causes of the Wealth of Nations (1776).
  • Central propositions
    • Markets governed by natural laws analogous to Newton’s physical laws.
    • Individuals who pursue self-interest promote social welfare through competition.
    • Famous quotation: “It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest.”
    • Competition regulates self-interest ⇒ prevents exploitation; drives prices to the lowest sustainable level.
    • “Invisible hand of the market” = decentralized decisions → efficient resource use.
    • System known as laissez-faire (laissez faire=“let do”\text{laissez\ faire}=\text{“let do”}): minimal government intervention.
  • Role for Government (3 functions)
    • National defence.
    • Internal security & justice system.
    • Provision of public infrastructure (roads, bridges, canals) funded by taxation.
  • Additional insights
    • Fear of monopolies: “The price of monopoly is… the highest which can be got.” Competition is protective.
    • Division of labour ⇒ specialisation ⇒ higher productivity ⇒ economic growth.
    • Extended to international trade via absolute advantage: each country should export goods it produces at lowest cost and import others.
    • Earlier work The Theory of Moral Sentiments (1759) stresses empathy; Smith never claimed people are purely greedy.
  • Legacy in modern syllabus
    • Demand–supply analysis, market equilibrium, trade theory all stem from Smith.

19th Century – Classical Economics, Utilitarianism & the Margin

Utilitarian Ethics ➔ Economic Theory

  • Jeremy Bentham (1748-1832)
    • Founded Utilitarianism: right actions maximise “the greatest happiness of the greatest number.”
    • Defines utility as anything producing “benefit, advantage, pleasure, good or happiness” or preventing pain.
  • John Stuart Mill (1806-1873)
    • Combined Bentham’s utility with human rights; defended individual liberty and women’s rights.
    • Quote: “Actions are right in proportion as they tend to promote happiness…”
  • Utility concept migrated into economics as the measure of satisfaction.

Marginalist Revolution

  • Earlier value theory: Labour Theory of Value (price determined by labour hours).
  • Three independent innovators shifted focus to utility & the margin:
    • William Stanley Jevons (UK, 1835-1882)
    • Carl Menger (Austria, 1840-1921)
    • Léon Walras (France, 1834-1910)
  • Key points
    • Value depends on utility, not labour.
    • Relevant utility is marginal utility (additional satisfaction from one extra unit).
    • Example with Amandla’s ice-creams:
      • 1st cone ⇒ 5 utils5 \text{ utils}; 2nd cone increases total to 99 ⇒ marginal utility =4=4.
      • Successive units give diminishing marginal utility ⇒ Law of Diminishing Marginal Utility.
    • Alfred Marshall (1842-1924) used marginal utility to derive the Law of Demand and full demand–supply market model.
    • Term marginal becomes pervasive in economics (marginal cost, revenue, product, tax, etc.).

Classical Macroeconomics – Say’s Law

  • Jean-Baptiste Say (1767-1832): “Supply creates its own demand\text{Supply creates its own demand}.”
    • In circular-flow terms: production ⇒ incomes ⇒ spending that buys the very output.
    • Implication: Persistent unemployment impossible; economy self-corrects.
  • Worked under laissez-faire assumptions; no micro–macro split yet.
  • Great Depression later challenged this doctrine.

Marxist Critique

  • Karl Marx (1818-1883); Capital (1867).
  • Adopted labour-value theory; introduced surplus value =Price−Wages= \text{Price} - \text{Wages}.
    • Surplus value ≡ profit ⇒ exploitation of labour.
  • Historical materialism predicts sequence: Feudalism → Capitalism → Communism.
    • Competition forces capitalists to mechanise ⇒ falling profits & rising unemployment ⇒ crisis & overthrow.
  • Although collapse of capitalism did not occur, Marx foresaw:
    • Business cycles, income inequality, wage stagnation, technological unemployment.
    • Continues to influence sociology, political science, heterodox economics.

20th Century – From Keynes to Monetarism & New Classics

Keynesian Revolution

  • John Maynard Keynes (1883-1946); The General Theory of Employment, Interest and Money (1936).
  • Rejected Say’s Law; argued economy can settle below full employment.
    • Sticky wages & prices prevent self-adjustment.
    • Falling wages cut worker spending ⇒ further demand decline.
  • Policy prescription: Active fiscal policy (government spending) to raise aggregate demand.
    • Multiplier: initial government outlay induces multiplied income & spending.
  • Outcome: Birth of macroeconomics (term coined 1945 by Jacob Marschak) and of macroeconomic policy.

Monetarist / New-Classical Counter-Revolution (1970s →)

  • Trigger: 1970s stagflation; Keynesian tools failed against cost-push inflation.
  • Monetarism (Milton Friedman, 1912-2006)
    • Emphasises money supply: ΔMs\Delta M_s drives short-run output, long-run price level.
  • New Classical Economics (Robert Lucas, b. 1937)
    • Rational expectations; markets clear if wages & prices flexible.
  • Shared core belief
    • Markets auto-correct to full employment; government intervention (minimum wages, unions, regulations) causes stickiness.
    • Inspired market-based supply-side policies.

21st Century – Behaviour, Sustainability & Circular Economy

Behavioural Economics

  • Cross-fertilisation with psychology questions rational, utility-maximising consumer.
  • Method: Controlled experiments & empirical evidence, not pure deductive theory.
  • Nobel recognitions
    • Daniel Kahneman (2002): judgement & decision-making under uncertainty.
    • Robert J. Shiller (2013): behavioural finance & asset prices.
    • Richard Thaler (2017): predictable irrationality; “nudge” policies.
  • Policy goal: Design incentives nudging consumers toward socially desirable actions.

Economy–Society–Environment Interdependence & Circular Economy

  • Sustainability = maintaining resource quantity & quality over time (people, planet, profit).
  • Critique of take-make-dispose linear model.
  • Circular economy aims to:
    • Keep resources “in use for as long as possible.”
    • Extract maximum value while in use.
    • Recover & regenerate products/materials at end of life.
    • Facilitate repair, reuse, recycling; use biological inputs returning safely to biosphere.
  • Quotation (London Waste & Recycling Board): “…recover and regenerate products and materials at the end of their life.”

Key Concepts, Terms & Numerical References

  • Invisible hand, laissez faire, competition, monopoly, division of labour, absolute advantage, utility, marginal utility, diminishing marginal utility, Labour Theory of Value, surplus value, Say’s Law, sticky wages/prices, multiplier, stagflation, money supply, rational expectations, behavioural bias, circular economy.
  • Major years: 1776 (Wealth of Nations), 1867 (Capital), 1936 (General Theory), 1970s (oil crisis), Nobel prizes 2002/2013/2017.

Ethical, Philosophical & Practical Implications

  • Utilitarian ethics still informs welfare economics & cost-benefit analysis.
  • Marx raises ethical issues of exploitation & inequality, influencing labour policy debates.
  • Keynes legitimises state responsibility for stabilisation & social welfare.
  • Monetarist/New-Classical schools revive debate on market freedom vs. regulation.
  • Behavioural economics reshapes paternalistic policy design (e.g., default options, “nudges”).
  • Circular economy links economic policy to environmental stewardship and social responsibility.

Cross-Connections & Real-World Relevance

  • Smith → free-trade agreements & antitrust laws.
  • Marginalism → modern consumer choice theory, pricing strategies, taxation policy.
  • Say’s Law debate resurfaces in discussions on austerity vs. stimulus.
  • Keynesian tools deployed in 2008–09 global financial crisis stimulus packages.
  • Monetarist views guide central-bank inflation targeting.
  • Behavioural insights applied in pension auto-enrolment, organ-donor defaults.
  • Circular-economy principles embodied in EU Green Deal, corporate ESG strategies.

Summary Bullets

  • 18th C: Smith formulates laissez-faire, invisible hand, division of labour, role-of-government triad.
  • 19th C: Utilitarianism & marginal utility transform value theory; Say’s Law posits automatic full employment; Marx critiques capitalist surplus value.
  • 20th C: Keynes overturns classical view; macroeconomics & fiscal policy emerge; monetarist & new-classical thinkers re-assert market self-correction.
  • 21st C: Behavioural economics questions rationality; sustainability movement stresses circular economy & triple-bottom-line integration.

End of comprehensive study notes; re-read after completing the full textbook to appreciate historical depth.