‘Just keep it flowing.’ Three people working to untangle supply chain.

For every supply chain chokepoint, there’s a person working to free it up. Three frontline workers walk us through the global backlog, showing the humanity behind the quest to restock your store’s empty shelves.

Inside Miracle Mile Toys & Gifts in Los Angeles, owner Christina Mullin is deftly guiding a customer past the disruption in toy deliveries caused by the global supply chain backup. Of specific concern is an adorable wooden train that carries safari animals.

“We’re out of that,” she apologizes to a woman who wants it for her little boy....