The document discusses a proposed smartphone app called MallSage that would provide an integrated shopping experience for customers across multiple retailers in a mall by offering features like in-store navigation, product searches and comparisons, targeted deals and promotions, and online ordering with in-store pickup to improve the customer experience and increase sales and foot traffic for retailers. It outlines the challenges currently facing malls and retailers from the shift to digital shopping and how the proposed app could help address those challenges through its unified shopping features.