The federal budget is central to Congress's ability to exercise its "power of the purse." Over the last several fiscal years the imbalance between spending and revenues has grown as a result of the economic downturn and policies enacted in response to financial turmoil. In FY2010, the last completed fiscal year, the U.S. government spent $3,456 billion (23.8% of GDP) and collected $2,162 billion in revenue (14.9% of GDP), resulting in a budget deficit of $1,294 billion (8.9% of GDP).