The size of the debt owed to the CBR has raised doubts over repayment. The CBR is based on the assumption that the general fund deficit will remain constant over time (allowing paybacks to balance draws). Believing this to be mistaken, critics allege the state uses resources from the CBR to avoid reducing the budget, acknowledging debt, or increasing taxes. According to them, falling oil revenues and growing spending requirements will leave paybacks consistently lower than draws, causing the CBR to fail.