Should we go to plastic money?

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Coming soon: Plastic fund-storage chips in credit-card type 'plastic cash' system. -You go to work... -You get paid... -"Kerching"...your account is updated. -You stop at the store to get something... -You slide your card thru to buy it...0 -Purchase is deducted; new balance shows up on card display. Done Deal. No paper. No coins. No counting change. Advantages? Disadvantages? Issues?