Frillen
8
Thart may be true where you live, but in Denmark(where I live) and most of EU countries, mortgage is usually every 3 months(quarterly), but pretty much everything else is monthly, there are though a few exceptions where you can choose between monthly, quarterly, half yearly or yearly, this is mostly things like insurance, television licence and a few others.
But here is the thing interest is calculated in a way so that you will pay the same no matter how often you pay(weekly, monthly etc.), however it usually gets more costly to handle things more often than less, fee per time for handling these things is the same whether you pay for a week, month etc. so in the long run you save money by using monthly payments rather than weekly, which would cost you more and also add to the cost and time for the reciever 
So for us it makes much sense to have monthly salaries, bills etc. because you pretty know how much you have left every month, especially if you have a budget account plan in the bank 
Personally though I don’t get much into interest simply because I never use loans, I just pay cash because I always have a good saving for when we need something new 