The supply-side concentration in the international market for hard coal as for instance measured by the HHI is in fact quite high (IEA, 2007). Due to a variety of facts such as Southern and South-Eastern China becoming more import dependent and Indonesia tightening exports, both, the correlation of hard coal benchmark prices for major import areas (such as the API#2 index for delivery to Amsterdam-Rotterdam-Antwerp) with world oil prices, as well as price volatility have increased over the last few years. Often international trade flow data for fuels are hard to get by, amongst others for confidentiality reasons.