“The general theory of economic equilibrium was strengthened and made effective as an organon of thought by two powerful subsidiary conceptions — the Margin and Substitution. The notion of the Margin was extended beyond [Utility]] to describe the equilibrium point in given conditions of any economic factor which can be regarded as capable of small variations about a given value, or in its functional relation to a given value.”

Source: Essays In Biography (1933), Alfred Marshall, p. 223

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John Maynard Keynes122

British economist 1883–1946

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“An important object of the Journal should be the publication of papers dealing with attempts at statistical verification of the laws of economic theory, and further the publication of papers dealing with the purely abstract problems of quantitative economics, such as problems in the quantitative definition of the fundamental concepts of economics and problems in the theory of economic equilibrium.
The term equilibrium theory is here interpreted as including both the classical equilibrium theory proceeding on the lines of Walras, Pareto, and Marshall, and the more general equilibrium theory which is now beginning to grow out of the classical equilibrium theory, partly through the influence of the modern study of economic statistics. Taken in this broad sense the equilibrium problems include virtually all those fundamental problems of production, circulation, distribution and consumption, which can be made the object of a quantitative study. More precisely: The equilibrium theory in the sense here used is a body of doctrines that treats all these problems from a certain point of view, which is contrasted on one side with the verbal treatment of economic problems and on the other side with the purely empirical-statistical approach to economic problems”

Ragnar Frisch (1895–1973) Norwegian economist

Frisch (1927). as quoted in: Bjerkholt, Olav, and Duo Qin. A Dynamic Approach to Economic Theory: The Yale Lectures of Ragnar Frisch. Routledge, 2010: About "Oekonometrika"
1920

“It is probable that when future historians of economic thought look back over this century, the thirties will appear as an era of rapid development in economic theory. Not only has there been unusual activity in monetary theory, theory of value. but extensive transformations have also been made in the basic theory of value. The outstanding publications in this field are, of course, Joan Robinson's Theory of Imperfect Competition and Chamberlin's Theory of Monopolistic Competition, the first produced in Cambridge, England, and the second in Cambridge, Massachusetts. These volumes mark the explicit recognition of the theory of the firm as an integral division of economic analysis upon which rests the whole fabric of equilibrium theory. General equilibrium is nothing more than the problem of the interaction of individual economic organisms, under various conditions and assumptions; as a necessary preliminary to its solution, an adequate theory of the individual organism itself is necessary.”

Kenneth E. Boulding (1910–1993) British-American economist

Source: 1940s, The theory of the firm in the last ten Years, 1942, p. 791

“The problem is one in the general physiology of society. The continuance of life and health for any individual depends on maintenance of a moving organic equilibrium within certain definite limits of tolerance. The daily work of the world is done by individuals living their specialized economic and social lives within a moving equilibrium… But specialized progress brought uneven social and economic developments and serious maladjustment. General equilibrium is lost. The limits of tolerance, the margins of safety, are exceeded.”

Wallace Brett Donham (1877–1954) American academic

Source: "The Failure of Business Leadership and the Responsibility of the Universities", 1933, p. 423; as cited in: Wallace Donham http://www.eoht.info/page/Wallace+Donham at Hmolpedia, 2015

“The usefulness of observation and measurement in testing economic theories arises because the theorems of economics are supposed to relate to the actual world… Any economic theorem rigorously deduced from given postulates may be regarded as a hypothesis about the actual world which xperience may show to be false.”

Richard Stone (1913–1991) British economist, Nobel Memorial Prize winner

Source: The Role of Measurement in Economics. 1951, p. 12

“In many parts of the economy, stabilizing forces appear not to operate. Instead, positive feedback magniﬁes the effects of small economic shifts; the economic models that describe such effects differ vastly from the conventional ones. Diminishing returns imply a single equilibrium point for the economy, but positive feedback – increasing returns – makes for many possible equilibrium points. There is no guarantee that the particular economic outcome selected from among the many alternatives will be the “best” one.”

W. Brian Arthur (1946) American economist

Source: Increasing Returns and Path Dependence in the Economy, (1994), p. 1: Chapter 1. Positive feedback in economics

“Economic theory in general ignores processes which take time to occur, and instead assumes that everything occurs in equilibrium.”

Steve Keen (1953) Australian economist

Source: Debunking Economics - The Naked Emperor Of The Social Sciences (2001), Chapter 8, Let's Do The Time Warp Again, p. 166

“Since economics deals with human beings, the problems of its scientific treatment involves fundamental problems of the relations between man and his world. From a rational or scientific point of view, all practically real problems are problems in economics. The problem of life is to utilize resources "economically," to make them go as far as possible in the production of desired results. The general theory of economics is therefore simply the rationale of life. - In so far as it has any rationale! The first question in regard to scientific economics is this question of how far life is rational, how far its problems reduce to the form of using given means to achieve given ends. Now this, we shall contend, is not very far; the scientific view of life is a limited and partial view; life is at bottom an exploration in the field of values, an attempt to discover values, rather than on the basis of knowledge of them to produce and enjoy them to the greatest possible extent. We strive to "know ourselves," to find out our real wants, more than to get what we want. This fact sets a first and most sweeping limitation to the conception of economics as a science.”

Frank Knight (1885–1972) American economist

Source: "The limitations of scientific method in economics", 1924, p. 97 (2009 edition); Lead paragraph

“Economic theory is devoted to the study of equilibrium positions.”

George Soros (1930) Hungarian-American business magnate, investor, and philanthropist

The Alchemy of Finance: Reading the Mind of the Market (1987)
Context: Economic theory is devoted to the study of equilibrium positions. The concept of equilibrium is very useful. It allows us to focus on the final outcome rather than the process that leads up to it. But the concept is also very deceptive. It has the aura of something empirical: since the adjustment process is supposed to lead to an equilibrium, an equilibrium position seems somehow implicit in our observations. That is not true. Equilibrium itself has rarely been observed in real life — market prices have a notorious habit of fluctuating.

“I had become interested in economics, an interest that was transformed into a lifetime dedication when I met with the mathematical theory of general economic equilibrium.”

Gérard Debreu (1921–2004) French economist and mathematician

" Gerard Debreu - Biographical http://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/1983/debreu-bio.html". in: Les Prix Nobel. The Nobel Prizes 1983, Editor Wilhelm Odelberg, [Nobel Foundation], Stockholm, 1984; Republished at Nobelprize.org. Nobel Media AB 2014.

“I do not overlook the important contributions to economic theory in the past whether orthodox or heterodox I correlate them with institutional economics. The classical and communistic economists used as their measure of value the man hour of labor. This is evidently since the incoming of scientific management the engineering economics of efficiency. The Austrian and hedonistic economists deriving from Bentham used as the measure of value the diminishing marginal utility of consumption goods. This is evidently the home economics recently introduced in the college curriculum.”

John R. Commons (1862–1945) United States institutional economist and labor historian

Source: "Institutional economics," 1936, p. 242

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