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Dunstan's absence is noticed by those who rely on him, causing concern and disruption. His presence is missed, and people may question his whereabouts or express frustration at his unavailability. Overall, his absence is seen as a notable change in the usual state of affairs.
shortage
Your first clue... would be the absence of your normal (expected) period.
Unavailability.
Most people would not notice its absence.
Shortage
Shortage
Scarcity
because of unavailability of gravity.
Eventually the plant, animal or human would die.
Weak distribution chain, fierce local competition, and unavailability of land.
Nothing whatsoever. Absolutely nothing. Just one less thing for a few people to notice in the night sky once in a while.