I didn't get that from the song. I got:
* Our wealth is built on debt
* The most recent crash is an inevitable correction that will always occur when debt outstrips income
* Debt will always outstrip income eventually - income doesn't grow as fast as debt in our economy
* Wall street and banks generate wealth by creating more ways to give people more debt - which is why it always outstrips income
I didn't get the message that another (worse?) crash is imminent...