noun / verb
boom
A deep, loud, resonant sound or its production.
The mallet strikes the bass drum with a deep boom.
Etymology
An imitative word for a resonant sound. Rapid economic growth is a figurative extension; the spar or crane-boom word has a different history.
In context
So if the boom is the problem, then the recession that follows should be viewed not as the disaster itself, but as a painful necessary period of healing, a correction.