Abstract
AbstractThe central market hypothesis is important in the analysis of market integration because it implies a specific market structure while avoiding a simultaneity problem. However, despite its importance, the central market hypothesis is difficult to test and is therefore often assumed. This article shows that the hypothesis can be tested in a Johansen cointegration test provided that prices are nonstationary. This approach is applied to reveal the existence of central markets for sorghum in Tanzania. The results indicate that the Tanzanian sorghum market can be grouped into two market regions, with prices being determined in a central market in each region.
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