When you put your money into the back, your money goes into a big "Pool" of money along with everyone elses. Then, your account is credited with the amount of money that you deposited, or put into the back. When you write a check or take out money, that amount is taken away from your account. You can also earn interest on your money in your account.
Hope this helps!
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answer: karl marx, max weber, and emile durkheim (the fourth could be considered georg simmel)