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LEAVE YOUR CASH AT HOME

You want to buy a screwdriver, or a newspaper, or a cup of coffee. But all you have in your wallet are $20 bills and a bunch of credit and/or debit cards. Try using one of these for such a small purchase. Just try.

If you happen to live on Manhattan's Upper West Side, though, you might get a chance this week to test a way around this minor annoyance--and in the process, become a trailblazer on the march to the totally cashless society. Just insert a special card into a special terminal or reader on the store counter and press...

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