Wal-Mart Stores is the world's biggest retailer, but it lags when it comes to catching up online with Amazon, something Wal-Mart is working to overcome by borrowing ideas from Amazon, such as lockers for shoppers to pick up purchases. However, Wal-Mart is still behind in the fastest-growing online arena: fresh food and perishable groceries. Such sales are growing nearly twice as fast as overall online retail, Nielsen's Todd Hale says.

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