Wouldn’t that just be a fertility rate below 1?

Rate of 2: 2 babies are born per human death, population grows

Rate of 1: 1 baby is born per death, population remains the same

Rate of 0.5: 1 baby is born for every 2 deaths, pop. decreases.

Rate of 0: no babies are born, but people still die.

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What would a negative fertility rate mean? A rate of -1? I don’t think it could exist.