Yeah yeah, I know what they are for. But how are they priced? Growing up, I always thought it was 1 month's rent, that way if the tenant bounces on the landlord without paying the rent, the landlord is covered. Then I lived in a few places where it was a half-months rent. Recently I just looked at some apartments where it was 10-15% of one-months rent. Is there any rhyme or reason to it? Are apartment managers lemmings and just following the crowd of other complexes in setting these rates?