What’s In Your Wallet? Wait, You Don’t Need One

Most Americans pay with plastic or cash when they visit the grocery store, buy their daily coffee, or fill up the gas tank. But a growing number of large companies are trying to change that.

Google, Starbucks and Wal-Mart are among the many firms that are eager to replace consumers’ wallets and stores’ cash registers, with smartphones and other mobile devices.

Recently, Intuit — the company that owns the personal finance site Mint and makes TurboTax and Quicken — has been selling a small attachment for smartphones called “Go Payment.” The device lets almost anyone, anywhere accept a credit card.