There is one more concern. If an account has only $10.00 left in the account and the consumer purchases five items of value: $1, $2, $3, $11, $2. Then at the end of the day the bank can deduct the amount in the following sequence: 10-1-2-2-3-11, this way the consumer gets only one over draft charge. However, what typical banks do is they start with the higher charge first, 10-11-3-2-2-1 , now they really make more money here with 5 overdraft charges. And when you go to the bank they say 'we have given your account lot of consideration and we will remove 2 overdraft charges' 'I am sorry sir there is nothing we can do, it is bank policy' 'Since we adhere strictly to the bank policy' 'we have no control over this'... you name it. Its all a scam.
In the first place banks should not approve of a transaction above the account balance. Even if it is one cent more. But they wont make money that way. Not to mention the large investments banks do with our money. The older banking system was better, you pay with what you have.