Buyers take note: Because of China's new 10% export tax on primary refined tin, the world's biggest supplying nation could cut exports in 2008, which could tighten the market for global refined tin and boost prices. The new tax went into effect January 1 and is meant to keep more tin inside of China to support demand from the country's electronics and chemicals industries, among others. China also eliminated a 2% import tax on copper recently, which means more copper supply will likely be headed there.