Federal States often have persistent losers.  Within federal states, some federal units are often persistently weaker within the state that others and thus have to repeatedly accommodate (this links to the argument above).1 In countries such as Nigeria, resource rich parts of the country are consistently used by the rest of the country as a source of wealth with insufficient investment in return.2 1 Centre for European Economic Research, 2011, 'Poor States, Rich Federal Government- Winners and Losers of the Emissions Trading Scheme,' Houseofnames.com, 'German Unification,' 2 Tai Ejibunu, Hassan. 'Nigeria's Niger Delta Crisis: Root Causes of Peacelessness.' European University Center for Peace Studies Research Papers. 07. 2007.