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"Oh! my dear," cried his wife, "I cannot bear to hear that mentioned. Pray do not talk of that odious man. I do think it is the hardest thing in the world, that your estate should be entailed away from your own children; and I am sure, if I had been you, I should have tried long ago to do something or other about it." (13.8-9)
Mrs. Bennet flips when she hears Mr. Collins's name, and we can't exactly blame her, but this passage also shows that she's kind of an idiot about money: it's not Mr. Bennet's fault that there's an entail on their house, and he can't just go "fix" it. It's the law. The point of the law is to keep the money and estate in the family, instead of seeing it split up among daughters or go to someone else's family when a daughter marries—which is really bad news if you just keep popping out girls.