To piggy back on this, genetic diversity increases survivability of a population. The population of Finland before this ancient famine was probably much more diverse. The famine was a bottleneck event which only allowed the survival of a certain group of people with genetic and/or social [read: monetary] advantages survived.
Fast forward to some hypothetical future calamity/bottleneck event and, if diversity has not recovered enough, the entire population could die out if they don't have enough people with advantageous genes to survive.
Jacquesatoutfaire t1_j1pou69 wrote
Reply to comment by thegagis in What does it mean for a population to be "genetically diverse"? by MysteriousLeader6187
To piggy back on this, genetic diversity increases survivability of a population. The population of Finland before this ancient famine was probably much more diverse. The famine was a bottleneck event which only allowed the survival of a certain group of people with genetic and/or social [read: monetary] advantages survived.
Fast forward to some hypothetical future calamity/bottleneck event and, if diversity has not recovered enough, the entire population could die out if they don't have enough people with advantageous genes to survive.