Once you've started working the Four Rules, you start to realize that most of your money is kind of... spoken for. You need to pay the rent, the utlities, insurance, and so on. When you get through the list of non-negotiables, there's often just a few hundred dollars each month to play around with in the budget, and those dollars are where the real gains are made. Like David Bach's "latte factor," the small optional expenses we accumulate without budgeting properly can add up to big savings over a surprisingly short amount of time.

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