Change in large system often starts gradually.
After a period where a factor influences the system but no change is observed, suddenly the effect becomes obvious. Why the sudden switch? If a change cannot be detected until it erupts, can the influence be detected?
These questions appear in complex systems of all types -- biological, human, financial, and others.
One possibility is that the normal spectrum of a system will show a difference in its statistical variance before there's a noticeable difference in the average.
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