The Integration of Tomato Markets in Ghana with and without Direct Trade Flows
Spatial market equilibrium theory views trade flow as the driving force behind market integration. We assess spatial price transmission between domestic tomato markets in Ghana to ascertain whether spatial price transmission veritably depends on direct trade between markets, or whether other forces drive market integration. We analyze a unique data set on tomato trade consisting of semi-weekly price and trade flow data for the five most important Ghanaian markets for fresh tomato, which represents one of the most important commercially produced and consumed vegetables in the country. A regime-dependent vector error correction model is proposed to investigate this question, and the results are compared with those of a linear vector error correction model. The analysis reveals that prices in net producing areas of Ghana, viz. Navrongo and Techiman, adjust quickly to disequilibria, while prices in most major consuming areas do not show significant error correction. Markets are partly found to be strongly integrated even in periods without direct trade flows. Information exchange among suppliers or third-market effects might offer possible explanations to this finding.
|Date of creation:||2009|
|Contact details of provider:|| Web page: http://www.iaae-agecon.org/|
More information through EDIRC
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Hansen, Bruce E. & Seo, Byeongseon, 2002.
"Testing for two-regime threshold cointegration in vector error-correction models,"
Journal of Econometrics,
Elsevier, vol. 110(2), pages 293-318, October.
- Tom Doan, "undated". "RATS programs to replicate Hansen/Seo paper on threshold cointegration," Statistical Software Components RTZ00092, Boston College Department of Economics.
- Bob Baulch, 1997. "Transfer Costs, Spatial Arbitrage, and Testing for Food Market Integration," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 79(2), pages 477-487.
- Christopher B. Barrett, 1996. "Market Analysis Methods: Are Our Enriched Toolkits Well Suited to Enlivened Markets?," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 78(3), pages 825-829.
- Jesús Gonzalo & Jean-Yves Pitarakis, 2006. "Threshold Effects in Cointegrating Relationships," Oxford Bulletin of Economics and Statistics, Department of Economics, University of Oxford, vol. 68(s1), pages 813-833, December.
- Pitarakis, Jean-Yves & Gonzalo, Jesús, 2006. "Threshold effects in cointegrating relationships," UC3M Working papers. Economics we20060621, Universidad Carlos III de Madrid. Departamento de Economía.
- Christopher B. Barrett & Jau Rong Li, 2002. "Distinguishing between Equilibrium and Integration in Spatial Price Analysis," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 84(2), pages 292-307.
- Paul L. Fackler & Hüseyin Tastan, 2008. "Estimating the Degree of Market Integration," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 90(1), pages 69-85. Full references (including those not matched with items on IDEAS)