In LeanSpark: Frugal by Design, Global in Impact, Jaideep Prabhu, Priyank Narayan and Mukesh Sud describe frugal innovation as more than low-cost improvisation. Their framework combines lean execution, purposeful simplicity, adaptive scalability and systemic sustainability to build affordable, resilient products and services that can scale without sacrificing quality. Source: Jaideep Prabhu, Priyank Narayan and Mukesh Sud