Amazon's latest store concept is a Walmart-style supercenter

A woman uses an Amazon dash cart during her grocery-shopping at a Whole Foods store in California.

Tayfun Coskun/Anadolu via Getty Images

• Local officials approved an Amazon plan to build a 225,000 square-foot mega store near Chicago.
• Plans said the facility would be used for both in-person shopping and e-commerce fulfillment.
• The move would put Amazon in more direct competition with big-box stores like Walmart and Target.

Amazon is beefing up its physical...