Document Type : Original Research

Authors

Shahid Chamran University of Ahvaz, Ahvaz, Iran

Abstract

It is important to analyze the relationship between inputs and economies in the production due to high share of added value and great contribution of cement industry in national production and construction projects. In this paper, returns to scale, elasticities of substitution, function coefficients and economies of scale in Fars Cement Company were extracted and analyzed using the composite cost function and dual cost approach. The iterated nonlinear seemingly unrelated regression (NLSUR) method from 2002 to 2012 and quarterly data with Limdep8 Software were used in order to extract the cost function. Allen cross partial elasticity results for each pair of inputs showed that labor is a substitution for capital and other services. Capital input and other services are complementary. In addition, demand price elasticities indicate inelasticity of production factors against changes in price of those factors. According to research results, production of cement in Fars Cement Company resulted in ascending economies of scale and returns to scale.   

Keywords

Abrate, G.; Erbetta, F., Fraquelli, G. and Vannoni, D. (2001).The costs of disposal and recycling: An application to Italian municipal solid waste services. Applied Economic, Working Paper., No. 20, June 2011.
Baumol, W. J.; Panzar, J. C. and Willig, R. D. (1982) . Contestable Markets and the Theory of Industry Structure. New York: Harcourt Brace Jovanovich.
Bloch, B.; Madden, G. and Savage, S. (2001).Economies of scale and scope in Australian telecommunications. Review of Industrial Organization,Vol.18, pp. 219-227.
Bottasso, A.; Conti, M., Piacenza, M. and Vannoni, D. (2010).The appropriateness of the poolability assumption for multiproduct technologies: Evidence from the English water and sewerage utilities. Production  Economics, Vol.130, pp. 115-117.
Caves, D.R.C, and Michael W.T. (1980). Flexible Cost Functions for Multiproduct Firms. this Review, 62. pp. 477-481.
Central Bank of the Islamic Republic of Iran, monthly statistical reports and economic indicators, various years
Christensen, L.R.; Jorgenson, D.W. and Lau, L.J. (1973). Transcendental Logarithmic Production Frontiers. The Review of Economics and Statistics,Vol.55, No.1, p.p. 28-45.
Dickey, D.A, and Fuller, W.A. (1979). Distribution of the Estimators for Autoregressive Time Series with a Unit Root. Journal of the American Statistical Association 74, 427-431.
Diewert, W.E. and Wales,T. J.(1987). Flexible Functional Forms and Global Curvature Conditions. Econometrica 55. 43-68.
Evans, D, and Heckman,J. (1983). Multiproduct Cost Function Estimates and Natural Monopoly Tests for the Bell System. In D. S.  Evans (ed.), Breaking Up Bell: Essays on Industrial Organization and Regulation. p.p. 253-282.
Ghorbani, Iman (2012), Studying the cost structure of Fars Gas Corporation using a composite cost function, Master's thesis, Department of Economics, University of Shiraz
Gujarati, Damudar (1999), Principles of Econometrics, Translated by Hamid Abrishami, Tehran: Tehran University Press
Karimi, Leila (2009), Studying the cost structure of Shiraz Water Supply and Wastewater, Master's thesis, Department of Economics, University of Shiraz
Lawrence, C. (1989). Banking Costs, Generalized Functional Forms, and Estimation of Economies of Scale and Scope. Journal of Money, Credit, and Banking 21 .p.p. 368-379.
Mancuso, P. (2011). Regulation and efficiency in transition: The case of telecommunications in Italy. Production Economics, Vol. 135, pp. 762-770.
Mutairi, N. Burney, A. (2002). Factor substitution, and economies of scale and utilization in Kuwait crude oil industry. Energy Economics, Vol. 24, pp. 337-354.
Negahban, Bita (2002), Estimating cost function of Iranian Telecommunication Company Iran and calculating productivity growth (a special case: wired telephone calls within the urban and suburban areas), Master's thesis, Department of Economics, Al-Zahra University
Piacenza, M. and Vannoni, D. (2004). Choosing among alternative cost function specifications: An application to Italian multi-utilities. Economies Letters, Vol. 82, pp. 415-422.
Pulley, L. and Braunstein, M. (1992). A composite cost function for multiproducte firms with an application to economies of scope in banking. The Review of Economics and Statics, Vol. 74, pp. 221-230.
Roller, L.H.(1990). Proper Quadratic Cost Functions with an Application to the Bell System. this Review 72. p.p. 202-210.
Salvatore, Dominic (2011). Theory and problems of statistics and econometrics, Translated by Kambiz Hajbar Kayani, Tehran: Ney Publication, second edition
Siddiqui, H. R., Lawler, K. E and Katus, E. (2007), Applied econometric approach, Translated by Shams Allah Shirin Bakhsh, Tehran: Avay Noor Publication
Surrey, Ali. (2012). Econometrics, Farhang Shenasi Publication
Uzawa, H. (1962). Production Function with Constant Elasticities of Substitution. the Review of Economics and Statistics, Vol. 70, No. 1,p.p. 67-75.
Varian, Hal, (1999), Microeconomic analysis, Translated by Reza Hosseini, Tehran: Ney Publication, Fifth Edition
Zellner, A. (1962). An Efficient Method of Estimating Seemingly Unrelated Regression and Tests for Aggregation Bias. Jouranl of American Statiscal Associations, Vol.57, p.p. 348-368.