Some immigrants are holding off because Congress has begun to consider an immigration overhaul that could offer legal permanent status to most of the 11 million illegal immigrants in the U.S. The DACA program doesn't offer a green card or a path to citizenship, and participants must reapply every two years.

WSJ: Young Immigrants' Applications to Stay in U.S. Fall Sharply

Next, we might have RFID chips embedded in shopping carts, shelves and her loyalty card that would identify the path she took through the store, what items she inspected but did not buy and so forth.

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If you travel off the beaten path, a credit card may be almost useless because vendors will expect payment in cash.

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