So full credit and hat tip to Pat for that linkage.

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In a day and age where few people actually carry cash, Digital Tip Jar allows users to tip their favorite musicians online using a credit card.

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But the research also shows that tip size is affected by the size of the dining party (larger groups tip more), the method of payment (credit cards yield higher percentages than checks or cash), and by the amount of alcohol consumed (not surprisingly).

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Ms. ANITA ESTERDAY (Waitress): She told me that they had paid with a credit card and had left a hundred dollar tip to be divided up amongst everybody that was working that day.

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But the biggest tip-off to DeArthur's troubles emerged in the summer of 2001, when the company apparently stopped accepting credit card payments.

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