Why, in the 21st century, should we still read Adam Smith? Often hailed as the “father of modern economics,” Smith is just as often dismissed as outdated—an 18th century thinker writing before industrialisation, automation, and the complex global economy we know today. Yet, as a closer reading of The Wealth of Nations (1776) reveals, Smith’s ideas remain deeply relevant—not because they offer final answers, but because they expose enduring questions about labour, value, and the structure of modern society.

This blog post offers a concise exploration of Smith’s place in economic thought, drawing on the evolution of economic theory in his time, his intellectual influences, and a critical evaluation of both his insights and his limitations. My blog is a shorter version of a longer (6,000 word) article which can be read here: Economics & the Value of Nations: A Snapshot on Smithian Scholarship.

The Modern Relevance of Adam Smith
At first glance, Smith’s world seems distant from ours. But on closer inspection, the society he described—what he termed “commercial society”—is the same one we inhabit today. Its defining feature is waged labour: people earning a living by selling their capacity to work. While earlier societies relied primarily on slaves, serfs, or domestic servants, Smith observed the rise of wage labour as the dominant social relationship—a condition that continues today.

Importantly, Smith wrote at a moment of transition. The social structure of modern capitalism had already emerged, even if the technological form—industrial machinery—had not yet fully developed. This gave him a unique vantage point. Without the distraction of machines, Smith could focus more clearly on the social relationships underpinning economic life, particularly how wages, profit, and rent are distributed across social classes.

Later economists, captivated by mechanisation, often misread these relationships. Thinkers such as Jean-Baptiste Say even treated machines as independent “factors of production” deserving income in their own right—an idea foreign to Smith. By contrast, Smith’s emphasis remained firmly on human labour and its organisation.

Competing Economic Theories in Smith’s Time
To understand Smith’s contribution, we need to situate him within the intellectual context of the late 18th century. Two dominant schools of thought shaped economic debate:

• Mercantilism
• Physiocracy

Smith’s work engages critically with both.

Mercantilism: Wealth Through Trade
Mercantilism argued that national wealth comes from maintaining a positive balance of trade—exporting more than you import. Rooted in the practical experience of merchants, it framed economic life as a process of buying cheap and selling dear.
However, mercantilist policies required heavy government intervention. States enforced monopolies, controlled trade routes, imposed tariffs, and maintained colonial systems to ensure profits. Colonies were restricted to trading with their “mother country,” creating protected markets that enriched merchants and, by extension, state revenues.

While this system could generate wealth for the metropole (e.g. Britain), it did so at a cost: higher prices, reduced competition, and greater inequality. Workers, in particular, bore the burden of inflated costs and heavy taxation. Despite Smith’s powerful critique, mercantilist policies persisted well into the 19th century, only gradually giving way to freer trade principles.

Physiocracy: Wealth from Nature
In contrast, the French Physiocrats located the source of wealth in nature, especially agriculture. Observing that agricultural production yields a surplus—planting one seed produces many—they concluded that only agriculture (and extractive industries like mining or fishing) truly created new wealth.

Urban industries, by comparison, were deemed “sterile.” A jeweller might reshape silver into necklaces, but the total quantity of silver remains unchanged. Physiocracy also introduced a powerful methodological innovation: systematic data collection. By tracking agricultural output, population, and economic activity, the Physiocrats could analyse economic growth empirically. They also advocated laissez-faire policies, arguing that government interference—such as price controls on bread—often made economic problems worse.

Smith’s Synthesis and Breakthrough
Adam Smith absorbed ideas from both traditions, particularly during his time in France, where he engaged directly with leading Physiocrats. Yet his contribution lies in transcending their limitations. Smith agreed that production is central to wealth, but he rejected the idea that only agriculture is productive. Instead, he identified human labour, across all sectors, as the true source of value.

His famous example of the pin factory illustrates this point. By dividing labour into specialised tasks, productivity increases dramatically—even without new machinery. This increase is not natural but social, arising from the organisation of work.
Smith also challenged the Physiocratic dismissal of trade. For him, exchange is not sterile; it motivates production. People produce not just for subsistence but for markets, responding to demand shaped by social needs.

Class Structure and Economic Insight
One of Smith’s enduring contributions is his clear articulation of a three-class system:

• Workers (earning wages)
• Capitalists (taking profit)
• Landowners (taking rent)

This framework remains influential today. Unlike earlier thinkers, Smith recognised the shared characteristics within each class. Workers across sectors are united by their dependence on wages, while business owners share a profit motive.

The Importance of Smith’s Library
Modern scholarship has deepened our understanding of Smith through the study of his personal library. This “hermeneutic” approach—interpreting Smith through the texts he read—reveals the intellectual world that shaped his thinking. Smith’s library contained works in multiple languages, travel accounts, and early economic texts like Richard Cantillon’s (1755 [1720s]) Essai sur la nature du commerce en général. By tracing Smith’s references back to these sources, we see how he adapted and reinterpreted earlier ideas.

For instance, from Cantillon, Smith draws insights about wages needing to cover not just workers’ survival but also population reproduction. This reflects a deep awareness of the relationship between labour, subsistence, and demographic growth.
Smith was also aware (from Cantillon’s work) that workers are perfectly capable of producing double what they require to survive.

The Labour Theory of Value: Insight and Problem
At the heart of Smith’s economics lies a powerful but problematic idea: that labour is the measure of value. In principle, this means that the value of goods reflects the (generic) labour time required to produce them.

However, Smith also recognises an apparent contradiction: workers do not receive the full value of what they produce. Instead, part of this value becomes profit for employers (and rent for landowners; interest for bankers; taxes for politicians).
This creates a theoretical tension. If goods exchange at their labour values, how can workers consistently receive less than the value of their labour?

Smith never fully resolves this issue. Later economists attempted to “correct” him, often abandoning the labour theory of value altogether. But another interpretation suggests that Smith was uncovering a real feature of capitalist society: a mismatch between value as a universal measure (of human effort) and the labour time of wage labourers (and how it can be the ‘measure’ of itself).

My longer article (link above) outlines this contradiction using the analogy of Kilograms as a measure of weight (which cannot then appear on the scales as a ‘Kilogram of Kilograms’). Marx resolved the ‘problem’ by noting that wage labourers are not paid for their ‘labour time’ (but for the product of their ‘recreation’ time, namely. their labour power.

Wealth vs. Value: A Crucial Distinction

Another key issue in Smith’s work is his use of the term “wealth.” He famously argues that labour is the source of all wealth, but this is only partly correct. Nature clearly provides wealth—sunlight, minerals, natural resources. What nature does not provide is value, which is a social construct arising from exchange. Smith’s failure to clearly distinguish between wealth and value leads to confusion. A more accurate title for his book might have been The Value of Nations, emphasising the social processes that determine economic outcomes.

Conclusion: A Thinker Worth Revisiting
Adam Smith’s Wealth of Nations remains a foundational text not because it offers flawless theory, but because it grapples with fundamental questions that are still unresolved in “mainstream” economic theory:

• What creates value?
• Why is value distributed in the way it is? [What is role of violence / exploitation?]
• What role do labour, nature, and exchange play in economic life?

Consequently, Smith’s insights into labour, class, and productivity continue to shape economic thought. At the same time, his unresolved contradictions—particularly around value and wages—highlight the complexity of the system he sought to understand. Far from being outdated, Smith’s work invites us to think more critically about the modern economy. His legacy lies not in providing final answers, but in opening a field of inquiry that remains in dispute.