With a satisfying thrum , the store’s holographic displays roared back to life. A digital mannequin appeared in the window, draped in a coat made of liquid silk that changed colors based on the viewer's mood.

"You're insane," Sarah whispered.

Retail’s dirty secret: the stuff people needed was often there. It was just buried .

: This recent review on ResearchGate explores how portable shopping apps allow consumers to order anytime/anywhere and highlights benefits like personalized rewards and detailed product visualization.