In the United States, recently the use of soybeans as an energy source has drawn attention. It is concerned in Japan that if the use of soybeans for energy keeps increasing, not only the price of conventional soybeans, which is used for soybean oil, but also the price of non-genetically modified...

This study investigates how markets for different levels of copper purity are interrelated by testing the long-run price linkage and causalities among the copper futures, primary, copper scrap, and brass scrap markets. It is expected that copper markets that deal with high purity levels, such as...