4a317c29_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: Deficit tax may raise a lot less than Treasury forecasts says analyst - ABC News (Australian Broadcasting Corporation)
Definition