Austen makes it clear in "Pride and Prejudice" that marriage is not about happiness. Austen illustrates this through the words and thoughts of Mrs. Bennet. Wanting her daughters to marry into money was her only concern: not caring about either one of their happiness. Again this ties back into first impression. Happiness in marriage was expressed as luck, not as it is in today's world. Although a first impression can attract one's attention, it is no longer what most people base their marriage off of.
Marriage, Information about Marriage." Internet FAQ Archives - Online Education. Web. 26 Mar. 2010.