World debt has been in “Up Only” mode since 1972
And has risen even more aggressively since 1997
It’s now surpassed a staggering $225 trillion
There’s no looking back now 
Discussion
Terrifying trend line.
All of that debt requires a return, and the rate global GDP growth is far lower than the rate of global debt growth.
The required return can only be extracted by squeezing harder on the productive parts of society.
Increased taxes? Creation of new forms of property? New, consolidated global mechanisms for debt recovery?