But Smith only wrote of the invisible hand, at least in economic terms, once--and in very specific context. The invisible hand relates to--and only to--the investment of domestic capital. Whereby a businessman, by investing capital domestically, will strengthen not only over all revenue of the country, but the nation's safety and well being. The "invisible hand" part is that this all happens in spite of the businessman's limited self-interest.
As every individual, therefore, endeavours as much as he can both to employ his capital in the support of domestic industry, and so to direct that industry that its produce may be of the greatest value, every individual necessarily labours to render the annual revenue of the society as great as he can. He generally, indeed, neither intends to promote the public interest, nor knows how much he is promoting it. By preferring the support of domestic to that of foreign industry, he intends only his own security; and by directing that industry in such a manner as its produce may be the greatest value, he intends only his own gain, and he is in this, as in many other cases, led by an invisible hand to promote an end which was no part of his intention. (The Wealth of Nations)
The unintended-benefit-for-all feature of capital investment, however, is limited to domestic investment if the market is not completely free. In an unfree market it cannot work. Our current global economy does not constitute a free market because, although there is free movement of capital and production, there is not a free movement of labor. John Bishop writes:
The overall argument of The Wealth of Nations implies that if an international free market could be established in goods, labour, and capital, then the same-nation restriction [investing in one's own country] would be lifted on capital investment. In today's world, we may be closer to an international free market in goods, and for all practical purposes we have free movement of capital, but labour movement across national boundaries is tightly restricted. Therefore, a free market does not exist internationally, the invisible hand cannot operate internationally to maximize global revenue, and so the same-nation restriction should still apply. (Adam Smith's Invisible Hand Argument)
It is in the best interest of a corporation to move its production to a third world country--because people will work for lower wage in more dangerous conditions--but it is not in my best interest as a worker to move to a third world country along with it. Nor could I always move with it even if I wanted to.
"[Smith] thought that individuals would prefer to invest their capital domestically because of the higher costs and difficulties associated with foreign investment in the eighteenth century" (Mohamed). In other words, the cost and danger of investing in distant markets, in Smith's time, would lead any rational person to invest within their own nation--because that would best serve their interest. The notion that giant, centralized corporations would one day be the rule, as opposed to the exception, of business and that these giants would "invest capital all over the world without national preference would have been inconceivable to Adam Smith" (Meeropol).
Libertarian minded individuals will insist that the solution is to weaken the government, since the source of market restriction that favors corporate interest usually comes from government intervention and regulation. And indeed, according to Smith's theory, in a GLOBALLY free-market, self interest and public interest--again, in the context of capital investment--will line up. (As a note I do agree with the libertarian supported notion of doing away with most corporate welfare.)But as Smith knew well we live in a world of nations who, more often than not, aim at personal advantage at the expense of other states. Though businessman can be counted on to act in league with self-interest, the same cannot always be said of politicians. Politics are often motivated by identity (tribal, ethnic, etc.) issues; they are as much motivated by passions as they are by reason. (Indeed the weak point of unfettered free-market ideology is the notion that, in order to function, all people will seek what is in their enlightened self-interest. Many businessman cannot be counted on to act in rational self-interest, nor to even know what is in their best interest in the first place.) As such there will always be nations who are willing (or eager) to pander to corporate interest in the name of personal advantage. And it is in the interest of corporations to restrict the freedom of the market, through oppression and exploitation. A fact Smith makes quite clear:
The interests of this third order [those who live by profit], therefore, has not connection with the general interest of the society as that of the other two [laborers and landlords]...The proposal of any new law or regulation of commerce which comes from this order [those who live by profit], ought always to be listened to with great precaution, and ought never to be adopted till after having been long and carefully examined, not only with the most scrupulous, but with the most suspicous attention. It comes from an order of men, whose interest is never exactly that of the publick, who have generally an interest to decieve and even to oppress the publick, and who accordingly have, upon many occasions, decieved and oppressed it. (Wealth of Nations) *Brackets are Bishop's
Businesses restrict the market, and thus exploit both consumers and workers, by "having monopolies, restrictive trade practices, price fixing conspiracies, and constraints on labor organization"(Bishop).
Nor is it in the best interest of merchants to have the consumer looking out for their own self-interest. There's a reason marketing campaigns are often targeted toward incentives other than lower price--tempting a consumer to make a choice based off image enhancement or sex appeal or brand loyalty relieves businesses from price competition, thus maximizing profit. It also tempts the consumer away from the most important question of all--Do I really need this product in the first place?