Well, your mobile wallet will replace the paper receipts with digital ones that you can archive and never lose, even if you lose your phone.

FORBES: Mobile: The Biggest Change To Hit Retailing In 50 Years

The otherwise worthless piece of paper in your wallet conveys value because of government decree.

FORBES: Not Just Another Article Espousing The Gold Standard

Hastily, mechanically, she reassembled the wallet, keeping the slip of paper in her hand.

NEWYORKER: Found Objects

If you really must keep one credit card in your wallet, wrap a piece of red paper around it and write in big, bold letters EMERGENCY.

FORBES: Ridding Yourself of Credit Card Debt

The man bent, found a wallet in his coat, took out a folded sheet of paper, offered it.

NPR: Excerpt: 'The Broken Shore'