Crude oil prices have been fluctuating over time and by a large range. It is the disorganization of oil price series that makes it difficult to deduce the changing trends of oil prices in the middle- and long-terms and predict their price levels in the short-term. Following a price-state...

The United States is the only large federal country that does not have an explicit way to reduce the economic disparities among more and less developed regions. In Germany, for example, federal revenues are distributed by a formula that takes into account the relative level of wealth of each...