Vertical Price Transmission in the Market of Potato and Onion (Case Study: Kurdistan Province)

Document Type : Research Paper

Author

Abstract

In this research, price transmission between wholesale and retail levels of two products, potato and onion has been studied. The data of wholesale and retail prices of Kurdistan province from 1386:12 to 1392:3 were used. According to the results of the ADF unit-root test series retail and wholesale prices of two products were integrated of order 1 and the Johansson cointegration test results indicated the prices for products were two series cointegrated. To examine the causal relationship between retail and wholesale prices of products, Toda –Yamamoto (1995) test was used and the results indicated that there was a one-way causal relationship from wholesale to retail for potato and onion. Hansen(1999)’s Sup-F test was carried out to examine the existing of nonlinear price adjustment that the result indicated that there were nonlinear price adjustment for potato and onion. Therefore, univariate TAR, M-TAR and LSTAR models were used. The results indicated asymmetry price transmission in potato and onion market. 

Keywords


  1. Department of Jihad Agriculture of Kurdistan Province. (2013). Market Regulatory Authority, Agricultural product prices, Department of Planning and Economic Affairs. Retrieved from: http://www.kurdistan.agri-jahad.ir (In Farsi)
  2. Balk, N. S. & Fomby, T. B. (1997). Threshold Cointegration. International Economic Review, 38, 45-627.
  3. Capps, J. O. & Sherwell, P. (2005). Spatial Asymmetry in Farm-Retail Price Transmission Associated with Fluid Milk Products. Selected Paper prepared for presentation at the American Agricultural Economics Association Annual Meeting, Providence, Rhode Island, July 24-27.
  4. Chan, K. S. & Tong, H. (1986). On estimating thresholds in autoregressive models. 1 Time series Anal, 7, 179-90.
  5. Chang, P. J. (2003). Threshold Cointegration and threshold dynamics, PhD dissertation, Iowa State University of US.
  6. Enders, W. & Siklos, P. L.  (2001). Cointegration and threshold adjustment, Department of Economics. Working paper: Iowa State University, Mimeo.
  7. Goodwin B. K. & Piggott, N. E. (2001). Spatial market integration in the presence of threshold effects. American Journal of Agricultural Economics, (83), 170- 302.
  8. Hansen, B. (1999). Threshold Effects in Non-Dynamic Panels: Estimation, Testing and Inference, Journal of Econometrics, 39, 345-368.
  9. Hoseini S., Salami, H. & Nikoukar, A. (2007). Price transmission of chicken meat structure in Iran. Journal of Agricultural Economics, 2(1), 1-21.
  10. Hoseini, S., Nikoukar, A. & Doorandish, A. (2009). Price transmission in the beef industry in Iran. Journal of Economics and Agricultural Development, 24(1), 23-32. (In Farsi)
  11. Kapetanios, G., Shin, Y. & Snell, A. (2003). Testing for Cointegration in Nonlinear STAR Error Correction Models, School of Economics, and University of Edinburgh.
  12. Ministry of Agriculture. (2012). Agricultural statistics, 1: crops, different years. (In Farsi)
  13. Pascalau, R. (2007). Testing for a Unit Root the Asymmetric Nonlinear Smooth Transition Framework, Department of Econometrics, Finance and Legal Studies, University of Alabama.
  14. Stigler, M. (2012). Threshold Cointegration: Overview and implementation in R, Revision4.
  15. Taheri, F., Moghaddasi, R. & Mousavi, N. (2010). Market structure and price transmission on corn world market. Journal of Agricultural Economics, 4 (3), 185-209.
  16. Toda, H. Y. & Yamamoto, T. (1995). Statistical Inference in Vector Autoregressive with Possibly Integrated Process , Journal of Econometrics. 66, 225-250.
  17. Tomek, W. G. & Rabinson, K. L. (2003). Marketing margins for farm products in agricultural product prices, 6, 107-127.
  18. Von Cramon- Taubadel, S. & Meyer, J. (2001). Asymmetric price transmission: fact or artifact?, Paper prepared for 71th EAAE seminar The Food Consumer in the early 21st century in Zaragoza, Spain, April 19- 20.

Yavari, F. (2012). Vertical price transmission and non-linear price adjustments in the beef market of East Azerbaijan province, Master’s thesis, University of Tabriz.  (In Farsi)