Spend $8 at the coffee shop, $5 dollars for a little snack later on... maybe $20 eating dinner at a restaurant with your co-workers later tonight. Rinse, wash, and repeat a few days a week and you'll start to wonder where all that extra cash you're supposed to have in your wallet actually went. And maybe you're not leaving your money "faucet" on full pressure all the time, but like any homeowner can tell you, even a constant drip can run up a bill at the end of the month. Helping us face our own money leaks today, from the Mad Money Monster blog, we welcome Lisa Harrison. Rounding out our contributors today is Paula Pant (from Afford Anything) and Len Penzo (from LenPenzo.com).

But that's not all... we'll also have time for Doug's trivia, and also will tackle a voicemail from a listener. Derek wants to know how you explain the concept of a non-physical thing, such as cash or credit on a card, to young kids?

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