摘要: … 2007. Monthly soybean oil prices rose to $1,522/ton in June 2008. Since oilseeds are close substitutes and prices highly correlated, this led to similar increases in other oilseeds prices. …
vsemirnyjbank.org
worldbank.org
stanford.edu 
tu.ac.th 参考文章(4)
Christopher L. Gilbert, Commodity Speculation and Commodity Investment FAO Commodity Market Review. pp. 25- 46 ,(2010)
John Baffes, Explaining stationary variables with non-stationary regressors Applied Economics Letters. ,vol. 4, pp. 69- 75 ,(1997) , 10.1080/758521836
Dominique van der Mensbrugghe, LINKAGE Technical Reference Document ,(2005)
Joachim von Braun, The world food situation: New driving forces and required actions Research Papers in Economics. ,(2007)