Because of the wide availability of debit cards and their usage, people are becoming accustomed to making many small purchases instead of using cash. Even one purchase for a few dollars, when it arrives at an account too short of cash, will cause the account holder to be charged upwards of $35 at some institutions.
Don’t go too long without balancing your check book or you are probably going to give yourself a headache! The best approach is to balance your account each month when your financial institution issues you a statement.