Harvey Leibenstein (1922 – February 28, 1994) was a Ukrainian-born American Jewish economist. One of his most important contributions to economics was the concept of x-efficiency and Critical Minimum Effort Thesis in development economics.
Harvey Leibenstein has developed the "critical minimum effort thesis". He says that the underdeveloped countries are trapped by the vicious circle of poverty and many other growth detarding factors which keep then in the state of backwardness. So these countries need increase their percapita income to a certain level where they can maintain a self sustained growth rate. So they need a critical minimum effort, .i.e. investment more than a minimum level to overcome all the obstacles of the underdeveloped countries.
In economics, x-efficiency is the effectiveness with which a given set of inputs are used to produce outputs. If a firm is producing the maximum output it can, given the resources it employs, such as men and machinery, and the best technology available, it is said to be technical-inefficient. x-inefficiency occurs when technical-efficiency is not achieved. The concept of x-efficiency was introduced by Harvey Leibenstein in his paper Allocative efficiency v. "x-efficiency" in American Economic Review 1966.
The concept of x-efficiency is also used in the theory of bureaucracy.
- 1950, "Bandwagon, Snob and Veblen Effects in the Theory of Consumer Demand", Quarterly Journal of Economics, Vol.64 No.2 : Page 183-207
- 1954, A Theory of Economic-Demographic Development, Foreword by Frank Notestein, Princeton, New Jersey: Princeton University Press
- 1966, Allocative Efficiency vs. "X-Efficiency", The American Economic Review, Vol. LVI., June 1966
- 1968, Entrepreneurship and Development, The American Economic Review, 58(2):72–83
- 1969, Organizational or Frictional Equilibria, The Quarterly Journal of Economics, Vol. LXXXIII, No. 4, November 1969.
- 1974, Socio-economic Fertility Theories and Their Relevance to Population Policy, International Labour Review, May/June 1974.
- 1974, An Interpretation of the Economic Theory of Fertility, Journal of Economic Literature, Vol. XII, No. 2, June 1974.
- 1975, The Economic Theory of Fertility Decline, The Quarterly Journal of Economics, Vol LXXXIX, No. 1, February 1975.
- 1976, Beyond Economic Man, Cambridge: Harvard: University Press
- 1978, General X-Efficiency Theory and Economic Development, New York: Oxford University Press
- 1978, "'X-inefficiency Exists: A Reply to an Exorcist," American Economic Review, 68 (1978): 208
- 1979, "A Branch of Economics Is Missing: Micro-Micro Theory," Journal of Economic Literature, 17: 477-502
- 1979, “The General X-Efficiency Paradigm and the Role of the Entrepreneur”. in: Mario Rizzo (ed.), Time, Uncertainty, and Disequilibrium. Lexington: Heath 1979, 127-139
- 1982, “The Prisoners’s Dilemma in the Invisible Hand: An Analysis of Intrafirm Productivity.” American Economic Review, (Papers and Proceedings) 72, no. 2 (May): 92–7
- 1983, "Property Rights and X-Efficiency: Comment." American Economic Review, 83: 831-42.
- 1987, Inside the Firm, The Inefficiencies of Hierarchy, Cambridge: Harvard University Press
- Harvey Leibenstein, Economic Backwardness and Economic Growth: Studies in the Theory of Economic Development
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