The living conditions during the black death were very hard for people who were poor. People who were rich would leave the cities to get away from the black death. Keep in mind that one in three people died during these pandemics. No one had any idea about bacteria or viruses. People thought that bad air caused the diseases.
Overall living conditions improved because labor shortages meant that the poor that survived received higher wages and had many more opportunities.
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Although the Black Death was a hugely disruptive event in Europe, most things did stay the same. For example, human beings still normally have ten fingers and ten toes after the Black Death, just as they did before. The moon continues to orbit the Earth, at the same distance. Diets and recipes were not revised. Chickens still eat grain, and people still eat chickens. And so forth.