The 'invisible hand' is a metaphor that Smith used to illustrate how an individual's pursuit of their own self-interest can unintentionally generate widespread social and economic benefits [citation:7][citation:11]. For instance, by seeking profit through serving others, a baker or brewer contributes to the public's welfare without intending to do so [citation:3]. This concept suggests that a free market, driven by self-interested actors, is more efficient at allocating resources and promoting prosperity than one guided by government regulation [citation:2][citation:7].

Smith conceived of a 'moral capitalism' that was fundamentally ethical. He believed that it required strict self-control and behavior governed by an inner conscience, acting as a 'great judge and arbiter of our conduct' [citation:1]. In contrast, 19th-century utilitarians often interpreted capitalism more narrowly, focusing solely on the mechanics of self-interest and utility, sometimes divorcing it from the moral and ethical framework that Smith considered essential for it to function justly [citation:1].

While Smith was a powerful critic of mercantilism and government regulation [citation:10][citation:12], he did not advocate for a completely unfettered market. He believed in a system of 'natural freedom' that required a foundation of laws, property rights, and competition [citation:3]. He also warned that businesses could use their power to create monopolies and engage in conspiracies against the public, and he supported some government interventions, such as public education, that he deemed necessary for societal well-being [citation:2][citation:9].

*The Wealth of Nations* centered on the idea that a nation's wealth is not built on gold or silver (as mercantilists believed), but on the productive labor of its people [citation:10]. It introduced foundational concepts like the division of labor, which dramatically increases productivity, and the mechanism of supply and demand [citation:2][citation:5]. Smith argued that the economy is a self-regulating system, and that when left with substantial freedom, it naturally tends toward order, efficiency, and growth, thereby enriching the nation as a whole [citation:2][citation:6].

This famous passage is central to Smith's argument that capitalism is a moral system [citation:3]. He pointed out that we rely on the butcher, baker, and brewer not out of their charity, but because they seek to profit from us. This reliance on their 'self-interest' is what reliably provides for our needs [citation:3]. Smith used this to show that the pursuit of private gain, guided by the 'invisible hand,' can be a more effective engine for public good than relying on philanthropy or altruism [citation:3].