Classical political economics was in part a discourse for the rising bourgeoisie, and as such most of its members – that accepted some version of the labor theory of value and that distribution was conflictive – were for laissez-faire policies. That was certainly the case of the Physiocrats, and of Adam Smith and David Ricardo, the two most accomplished of the British political economists.However, the classical analytical scheme did not assume full employment of labor or that the economic system was self-adjusted. Competition meant that market prices fluctuated around the natural prices, but those did not imply efficient allocation of resources. The notion that markets are self-adjusting with a tendency to full employment is a development of the last quarter of the nineteenth-century, and
Matias Vernengo considers the following as important: Hayek, Keynes, Keynesian Revolution, Laissez-faire, Marginalist Revolution, Neoliberalism, vulgar economics
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However, the classical analytical scheme did not assume full employment of labor or that the economic system was self-adjusted. Competition meant that market prices fluctuated around the natural prices, but those did not imply efficient allocation of resources. The notion that markets are self-adjusting with a tendency to full employment is a development of the last quarter of the nineteenth-century, and part of the so-called Marginalist Revolution. Marginalism also implied that each factor of production, capital and labor, received a share of income in accordance with the services rendered in production. Distribution was harmonious and not conflictive.[i] However, that did not imply that marginalist authors were all for laissez-faire.
It is clear that laissez-faire policies – leaving markets to its own devices without government intervention – could theoretically lead to efficient outcomes in the new theoretical scheme. But many marginalists authors believed that imperfections were relatively common in the real world and that under these circumstances some degree of government intervention was required. Market imperfections were a central reason for government intervention, before the Keynesian Revolution. In addition, most marginalists believed that economics was a science, technical in nature and not an art that required understanding of political factors, like class interests, wage bargaining, the power of capitalists, etc. These were imperfections, and they required government intervention. That was certainly the dominant view within marginalism associated with Cambridge University in England, and with its main academic figure Alfred Marshall.[ii]
Marginalists were part of a late nineteenth-century trend that believed in the power of experts, technocrats, in a period in which economics was becoming professionalized, and independent of the moral sciences. They were policy advisors. Simplifying considerably, one may say that classical authors were for laissez-faire, but not for the self-adjusting nature of capitalism, while marginalists were for the notion that markets are self-regulated, but less keen on hands-off governments. The conjunction of the two, the notion that laissez-faire capitalism is self-adjusting, was a distinctive feature of some of the marginalist authors, in particular the ones associated with the Austrian school, with Ludwig von Mises and his disciple Friedrich Hayek. That is, it is with the rise of neoliberalism that laissez-faire and the self-adjusting nature of capitalism become associated.[iii]
[i] The notion that distribution is harmonious and not conflictive as assumed by classical authors precedes marginalism or neoclassical economics, and was fundamentally developed in the period after the abandonment of Ricardian economics by pamphleteers and political economists that were afraid of the social implications of the work by David Ricardo, and the development of Socialist theories. Nassau Senior is probably the key author, and Frédéric Bastiat and Harriet Martineau the popularizers of the new dogma. Karl Marx referred to these post-classical authors as vulgar economists, and the term seems fitting.
[ii] Arthur Cecil Pigou, Marshall's main disciple, and John Maynard Keynes teacher, was concerned exactly with the imperfections caused by externalities that required some sort of government intervention. These would be taxes or subsidies, depending on the nature of the externalities.
[iii] Later, in the 1940s after encountering insurmountable problems with his theory of cycles and the notion of capital, when he distanced himself from economics, Hayek exposed a different argument in favor of laissez-faire policies based on complexity and unintended consequences of government intervention. In this case, the argument was that government failures were worse than market failures or imperfections.