fe45a3b1_lian_Broadcasting_Corporation___Definition
[Term] Revenue collapse [Definition] 
Over the past few years there has been a significant drop in the amount of tax revenue coming into the government. There is some contention over the reasons behind the drop, but economists are united in saying that at least part of the problem facing the government in its quest to return to a surplus stems from a lack of revenue, rather than too much government spending.
Budget 2014: Tony Abbott opens door to 'horse-trading' with minor parties in Senate to pass key measures - Federal Budget 2014 - ABC News (Australian Broadcasting Corporation)
Definition