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In the absence of external hedonic input, "entropy" renders one's hedonic stablepoint to be negative.
Desires :
It is desired that one's response to events are temporally invariant. (All else being equal, my reaction to an event should not depend on whether I experience it today or tomorrow)
It is desired to be able to forecast the (probability and impact of the) occurrence of future events as well as possible.
Given the above desires and assumptions, an all-knowing, time-invariant oracle that perfectly fulfills desires 1 and 2 will be perpetually unhappy (?).