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Cash may still be king, but its grip on the kingdom is increasingly threatened by payment technologies, some old and some new. Debit cards continue to gain popularity because you can use them anyplace that accepts credit cards and because they can be a good budgeting tool. And pay-by-smart-phone technology is being pushed by major players who see growth opportunity.

And now prepaid cards are opening yet a new front where paper currency has long reigned supreme: At automated teller machines. An Arizona company has developed a way to transform existing ATMs into dispensers of prepaid cards as well as cash. Read More