Pride and Prejudice
Why would Lydia's elpoement affect the other girls chances at making good marriges?
explanation
explanation
A young lady's elopement (especially following a period of unmarried co-habitation) could ruin both her future and her family's reputation. Therefore, Elizabeth is justifiably concerned that Lydia's irresponsible decision will ruin the possibility of another proposal from Darcy.
http://www.gradesaver.com/pride-and-prejudice/study-guide/summary-volume-iii-chapters-1-10