Caricature!

In Pride and Prejudice, Austen uses methods of caricature to simplify characters and not delve to much into their characters, e.g. Mrs Bennet comes a cross as a woman obsessed by marriage and nothing else, but there is no depth into why  she is like this. However there are exceptions to the theme of caricature, who are Mr Darcy and Elizabeth, as their characters develop throughout the book.