The European sovereign debt crisis began in late 2009 as fears grew over rising private and government debt levels in Europe. Greece, Ireland, and Portugal were hit hardest initially, accounting for 6% of Eurozone GDP combined. By 2012, concerns had spread to Spain as well. The crisis impacted EU politics and led to leadership changes in affected countries. Key causes included rising household and government debts, trade imbalances, structural issues in sharing a currency without a common fiscal policy, monetary policy inflexibility within the Eurozone, and loss of investor confidence. Long term solutions proposed integrating fiscal policies more through options like a European fiscal union or common Eurobonds.