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Market Integration And Price Transmission In The World Rice Export Markets, Bo Chen, Sayed H. Saghaian
Market Integration And Price Transmission In The World Rice Export Markets, Bo Chen, Sayed H. Saghaian
Agricultural Economics Faculty Publications
This paper investigates market integration and asymmetric price transmission in the world rice export markets. Using monthly rice prices from Thailand, Vietnam, and United States, we employ the Johansen test and estimate the threshold vector error correction model (TVECM). Our main findings are that export prices in the three countries are cointegrated, with Thailand and the United States the price leaders, and that the Vietnamese price adjusts faster to long-run equilibrium when it is above its equilibrium level with Thai and U.S. prices. These results suggest market integration and competition rather than collusion are prevalent in world rice markets. Policy …
Variable Consequences Of Toxic Prey On Generalist Insect Predators, Kelly Jackson
Variable Consequences Of Toxic Prey On Generalist Insect Predators, Kelly Jackson
Theses and Dissertations--Entomology
Introduced species, like the lady beetle Harmonia axyridis, have been linked to declines of native species through mechanisms including intraguild predation and competitive superiority. However, competitive differentials between species may be mitigated if subdominant species can utilize resources that dominant species cannot. Previous research has shown that some strains of the aphid Aphis craccivora are toxic to H. axyridis. My goal was to investigate use of this resource by both H. axyridis and other lady beetles, to determine whether these aphids might be an exploitable resource for subdominant lady beetle species. I first examined the behavioral responses of …