Market Adjustment Strategy for Qualitative Commodities Basket: Application of Weakly Exogenous Test for Iran’s Rice Market

Subject Areas : Agricultural Economics Research

S. S. Hosseini ¹ (استاد اقتصاد کشاورزی دانشکده اقتصاد و توسعه کشاورزی ،پردیس کشاورزی و منابع طبیعی دانشگاه تهران)
M. Kavoosi Kalashami ² (دانشجوی دکترای اقتصاد کشاورزی دانشکده اقتصاد و توسعه کشاورزی،پردیس کشاورزی و منابع طبیعی دانشگاه تهران)
Sh. Kavosi ³ (کارشناسی ارشد اقتصاد دانشگاه شهید بهشتی)

Received: 2015-12-16 Accepted : 2015-12-16 Published : 2012-06-21

Keywords: Rice, Price leadership, Weakly exogenous test, Co-integration,

Abstract :

Rice commodity basket involves different qualitative varieties in a way that establishing proper policies and programs for controlling and adjusting price in market is very difficult. According to qualitative difference of rice varieties, using different qualitative basket and price leader variety in market could be considered as two original solutions for adjusting rice market. For acquiring proper strategy in rice market adjustment on the basis of price relationship, present study investigated price relationship among seven main rice varieties’ price system include Sadri Momtaz, Sadri Daraje Yek, Sadri Mamoli, Binam, Tarom, Khazar and Neda during 1999 though 2009 using monthly time series data. Results of stationary ADF and KPSS tests showed that all of seven time series were I(1). Using co-integration test, long run relationship among mentioned time series were investigated. Bivariate co-integration test results revealed that Sadri Momtaz time series was independent from other system variables and should be omitted from the system. Finally, using adjustment matrix elements and weakly exogenous test, it was revealed that Sadri Daraje Yek, Khazar and Neda playing the role of price leadership in rice market. Existing weakly exogenous characteristic for Sadri Daraje Yek, Khazar and Neda varieties showed that these varieties were motive elements in process of determining price of other rice varieties. So, concentrating and basing adjustment market programs on price leadership varieties could result immediate, efficient and effective control of prices in rice market  

References:

1. Asche, F., Bremnes, H. and Wessells, C. 1999. Product

aggregation, market integration and relationships between prices:

An application to world salmon markets. American Journal of

Agricultural Economics. 81: 568-581.

2. Asche, F., Osmundsen, P. and Tveteras, R. 2002. European

market integration for gas? Volume flexibility and political risk.

Energy Economics. 24: 249-265.

3. Asche, F., Gjolberg, O. and Volker, T. 2003. Price relationship in

the petroleum market: an analysis of crude oil and refined product

prices. Energy Economics. 25: 289-301.

4. Baek, J. 2006. Price linkages in North American Softwood.

Canadian Journal of Forestry Resources. 36: 1527-1535.

5. Bauwens, L. and Lubrano, M. 1994. Identification restrictions and

posterior densities in cointegrated gaussian VAR systems.

Discussion paper. Université Catholique de Louvain.

6. Boswijk, H.P. and Urbain, J.P. 1997. Lagrange-Multiplier test for

Weak Exogeneity: A Synthesis. Econometric Reviews. 16: 21-38.

7. Engle, R.F. and Granger, C.W.J. 1987. Cointegration and ErrorCorrection:

Representation, Estimation and Testing.

Econometrica. 55: 251-276.

8. Engle, R.F., Hendry, D.F. and Richard, J.F. 1983. Exogeneity.

Econometrica. 51: 277-304.

9. Ericsson, N.R., Hendry, D.F. and Mizon, G.E. 1998. Exogenity,

cointegration, and economic policy analysis: an overview. Journal

of Business and Economic Statistics. 15: 370-387.

10. FAO. 2009. Available at: www.FAO.org

11. Fomby, B.T. 1998. How to model multivariate time series data.

Department of Economics. Southern Methodist University Dallas,

USA.

12. Ghoshray, A., Lioyd, T.A. and Rayner, A.J. 2000. EU Wheat

Prices and its Relation with other Major Wheat Export Prices.

Discussion Papers in Economics No. 00/8. School of Economics,

University of Nottingham.

13. Ghoshray, A. and Lioyd, T. 2003. Price Linkage in the

International Wheat Market. A paper presented to the

International Association of Agriculture Economists Triennial

Conference. Durban, South Africa, 18-22 August.

14. Ghoshray, A. 2007. An Examination of the Relationship between

U.S. and Canadian Durum Wheat Prices. Canadian Journal of

Agricultural Economics. 55: 49-62.

15. Hecq, A., Palm, F.C. and Urbain, J.P. 2002. Separation, Weak

Exogeneity and P-T Decomposition in Cointegrated VAR

Systems with Common Features. Econometric Reviews. 21: 273-

307.

16. Hendry, D.F. and Mizon, G.E. 1993. Evaluating dynamic models

by encompassing the VAR. in P.C.B Phillips, ed., Models,

methods, and applications of econometrics (Basil Blackwell,

Oxford), pp: 272-300.

17. Johansen, S. 1992. Cointegration in partial systems and the

efficiency of single-equation analysis. Journal of Econometrics.

52: 389-402.

18. Johansen, S. and Juselius, K. 1990. Maximum likelihood

estimation and inference on cointegration- with application to the

demand for money. Oxford Bulletin of Economics and Statistics,

52: 169-210.

19. Johansen, S. and Juselius, K. 1992. Testing structural hypotheses

in a multivariate cointegration analysis of the PPP and UIP for

UK. Journal of Econometrics. 53: 211-244.

20. Johansen, S. and Juselius, K. 1994. Identification of the long-run

and the short-run structure: an application to the ISLM model.

Journal of Econometrics. 63: 7–36.

21. Kuiper, W.E., Lutz, C. and Tilburg, A.V. 2003. Vertical price

leadership on local maize markets in Benin. Journal of

Development Economics. 71: 417-433.

22. Ministry of Jihad-Agriculture. 2010. Statistics of Iran’s rice

acreages.

23. Ministry of Jihad-Agriculture. 2010. Statistics of Iran’s different

rice varieties price.

24. Peyman, S.H. 2004. Improvement and rebuilding of Iran’s Rice

Milling Industry. Report of Ministry of Jihad-Agriculture.

25. Rault, C. 2000. Non-causality in VAR-ECM models with purely

exogenous long run paths. Economics Letters. 67: 121-129.

26. Rault, C. 2003. Further results on weak-exogeneity in vector error

correction models. EPEE. University of Evry and EUREQua.

Sorbonne University.

27. Rault, C. and L’Horty, Y. 2003. Why is French equilibrium

unemployment so high? An estimation of the WS-PS Model.

Journal of Applied Economics. 6: 127-156.

28. Rault, C. and Pradel, J. 2003. Exogeneity in VAR-ECM models

with purely exogenous long-run paths. Oxford Bulletin of

Economics and Statistics, 65: 629-653.

29. Strauss, J. and Wohar, M.E. 2004. The Linkage between Prices,

Wages, and Labor Productivity: A Panel Study of Manufacturing

Industries. Working Paper, Department of Economics, Saint

Louis University.

30. Urbain, J.P. 1992. On Weak Exogeneity in Error Correction

Models. Oxford Bulletin of Economics and Statistics. 54: 187-

207.

31. Yavapolkul, N., Gopinath, M. and Gulati, A. 2006. Post-Uruguay

Round price linkages between developed and developing

countries: the case of rice and wheat markets. Agricultural

Economics. 34: 259-272.