government revenue grows 24% since 2008, page-5

AP, an example to explain the lost or forgone revenue:

Pretend Scenario:

1. Pre-GFC yearly revenue increase = $10 p.a.
2. Post-GFC yearly revenue increase = $5 p.a.

The lost or forgone revenue, say, 5 years post GFC therefore = ($10 - $5) x 5 = $25.

All while population growth keeps on keeping on so demand for expenditure is a freight train that is hard to stop.