Gender Roles
Gender roles is very important to this novel, because in this time period, men were superior to women. For example, Mr.Collins is going to be given the Bennet estate when Mr.Bennet dies, because Mr.Bennet never bore a son. His five daughters are inadequate to own the estate.
Marriage
The Bennet daughters cannot have the family estate, because they are expected to get married to a wealthy man. That is why Mrs.Bennet is so fixated on arranging marriages for her daughters. During this time period, marriage wasn't necessarily for love, but for comfort and security. Marriage is also important to social status. When Lydia runs off with Wickham before they are properly married, the Bennet family goes crazy looking for her, because if word got out about it, the Bennet family would be labeled as a scandal.
Social Status
Mr.Bennet makes a modest income for his family, which allows them to attend balls with the Bingley's and Darcy, but there is constantly a barrier between the families. Miss Bingley judges the Bennet daughter's clothing and laughs at their absurd manners, Darcy critiques every girl to be not good looking enough for him, and Lady Catherine clearly threatens Elizabeth for even thinking she could marry a man like Darcy. In this time period, even the rich have rankings.