There are a number of scenarios that would result in the economy resembling a retreating tide rather than an advancing one (imagine the waves on a beach is coming in during a rising tide, each wave advances further than the previous one, the reverse being true for a receding tide).
The decline after peak oil (2005) continues to destroy demand due to the ever increasing costs involved in extracting the 80% that left as it’s harder to get!
Chindia decides to look inwards (& east) and drop their trade with the west.
Measures implamented to stop Global warming/ climate change (if you believe in it) stifle the economy.
Some other vital resources become scarce.
If any of the above scenarios were to happen, how would an economy structured to indefinite growth adapt?