<![CDATA[Variations in rice-price movements across regions and marketing levels indicate that price formation and market-information transmission are not uniform. This study describes rice-price developments at the producer level in Jambi, West Sumatra, and South Sumatra and at the wholesale and consumer levels in Jambi, and analyses horizontal and vertical market integration. Monthly prices from January 2021 to April 2026 were examined using descriptive and linear-trend analysis, vector autoregression, and error correction models within a cointegration framework. All series trended upward, although their rates of change and fluctuations differed. Producer markets did not share a long-run equilibrium, but one-way short-run linkages ran from West Sumatra to Jambi and from Jambi to South Sumatra. Vertically, the South Sumatra chain exhibited the broadest set of long-run relationships, whereas the West Sumatra and local Jambi chains showed no long-run linkage between producer and downstream prices. The wholesale-consumer segment displayed the most consistent adjustment mechanism. Rice-market integration in Jambi therefore varies across regions, marketing levels, and time horizons and does not necessarily imply proportional price transmission. The study’s originality lies in jointly analysing price trends and horizontal and vertical integration while retaining the geographical identity of each producer-price series.]]>
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