The subject did Naturalist author Émile Zola focus on in his novel L’Assommoir is that hardship and suffering in the slums of Paris.
Hardship is a period of want, here people and individual lacks the ability to provide for him or herself including their families.
It could be a period of recession in particular nation, leading to low circulation of money.
Therefore, the subject did Naturalist author Émile Zola focus on in his novel L’Assommoir is that hardship and suffering in the slums of Paris.
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