Adam Smith's Wealth of Nations: The Foundation of Modern Economics

An Inquiry into the Nature and Causes of the Wealth of Nations, published on March 9, 1776, is Adam Smith’s masterwork and one of the foundational texts of modern economics. The book is a comprehensive analysis of the economic system, dealing with the division of labor, the nature of money, the determination of prices, the role of government in economic life, the causes of economic growth, and the history of commercial society. This article examines the central arguments of the Wealth of Nations and its lasting influence on the development of modern economic thought.

The Central Argument

The Wealth of Nations develops a comprehensive account of the economic system, organized around the central idea that the wealth of a nation is determined by the productivity of its labor, and that the productivity of its labor is determined by the division of labor, the accumulation of capital, and the institutional framework within which economic activity takes place.

The argument is developed in five books. Book I deals with the division of labor, the origin of money, and the determination of prices. Book II deals with the nature of capital, the accumulation of capital, and the role of capital in the economic system. Book III deals with the history of economic development, tracing the rise of commercial society from the fall of the Roman Empire. Book IV deals with the various systems of political economy that have been proposed, especially the mercantilist system that dominated European economic policy in the seventeenth and eighteenth centuries. Book V deals with the proper role of government in the economic life.

The Division of Labor

The book opens with the famous example of the pin factory, presented as an illustration of the much more general claim that the division of labor is the source of the great improvements in productivity that distinguish modern commercial society from earlier, more primitive, forms of economic organization. Smith observes that ten workers, each performing a single operation in the production of pins, can produce thousands of pins a day, while a single worker, performing all the operations himself, can produce only a few.

The division of labor is not, in Smith’s view, the result of human wisdom. It is the gradual, unintended consequence of the human propensity to “truck, barter, and exchange one thing for another.” The development of markets, and the increasing specialization of economic activity, has produced an unprecedented increase in the productivity of human labor, and this increase in productivity is the foundation of the wealth of nations.

The Theory of Value

Smith develops a theory of value that distinguishes between value in use and value in exchange. The value in use of a commodity is its usefulness to the consumer. The value in exchange of a commodity is its power to command other commodities in exchange. Smith argues that the value in exchange of a commodity is determined, in a primitive society, by the amount of labor required to produce it. In a more advanced society, where capital is accumulated and land is privately owned, the value in exchange of a commodity is determined by the sum of the wages, the profits, and the rents that must be paid in order to produce it.

This distinction between the labor theory of value and the cost-of-production theory of value was an important development in the history of economic thought, and it set the stage for the subsequent development of classical and neoclassical economics.

The Critique of Mercantilism

The central target of Smith’s economic argument is the mercantilist system that dominated European economic policy in the seventeenth and eighteenth centuries. The mercantilists held that the wealth of a nation was determined by its stock of precious metals, and they advocated for a system of trade regulation, monopoly, and protection that was designed to maximize the inflow of gold and silver.

Smith argued that the mercantilist system was based on a fundamental misunderstanding of the nature of wealth. The wealth of a nation, he argued, was determined by the productivity of its labor, not by its stock of precious metals. The mercantilist system of regulation, monopoly, and protection, far from increasing the wealth of the nation, actually decreased it, by interfering with the spontaneous coordination of individual self-interests through the market.

Smith’s critique of mercantilism was a major contribution to the development of the modern theory of free trade, and it has had a lasting influence on the development of international economic policy.

The Role of Government

Smith was not a defender of unregulated capitalism in the modern sense. He believed that government had an important role to play in economic life, and he identified three duties of the sovereign: protecting society from violence and invasion, establishing an exact administration of justice, and erecting and maintaining certain public works and public institutions that would never be built or maintained by private interest.

Smith was also a severe critic of the various forms of monopoly and corporate privilege that characterized the economic life of his time. He argued that these forms of privilege were unjust, and that they were also economically inefficient, since they interfered with the spontaneous coordination of individual self-interests through the market.

The Theory of Economic Growth

Smith’s analysis of economic growth is one of the most sophisticated in the history of economic thought. He argues that the rate of economic growth depends on the proportion of productive to unproductive labor, on the level of investment, and on the institutional framework within which economic activity takes place.

The development of secure property rights, the rule of law, the improvement of transportation and communication, and the establishment of public education are all, in Smith’s view, important contributors to long-term economic growth. The proper role of government, in Smith’s view, is to create the institutional conditions that will allow the spontaneous coordination of individual self-interests through the market to produce the greatest possible increase in the wealth of the nation.

The Legacy

The Wealth of Nations has had a profound influence on the development of modern economic thought. The classical economists of the nineteenth century — David Ricardo, Thomas Malthus, John Stuart Mill — all drew on Smith’s pioneering work. The neoclassical economists of the late nineteenth century developed Smith’s insights in a more mathematical and abstract direction. The contemporary economics profession, whatever its disagreements, still operates within a framework that Smith established.

But Smith is more than a founding figure of a single academic discipline. He is one of the great thinkers of the modern world, whose work on moral philosophy, political economy, history, sociology, and the philosophy of law has had a lasting influence on the development of modern thought.