The technologies needed to raise living standards worldwide already exist. Solar panels, clean cookstoves, digital payment systems, and proven public health interventions could collectively support a universal reasonable quality of life. Yet over two billion people still cook with wood and dung, hundreds of millions lack reliable electricity, and the gap between what is known and what is delivered continues to widen. The problem is not knowledge. It is delivery. This handbook provides a practical framework for governments in emerging and developing economies to close that gap. It distinguishes between two fundamentally different challenges — optimisation (adapting proven solutions to local conditions) and diffusion (deploying them at population scale) — and shows how misdiagnosing which constraint is binding leads to wasted resources and stalled progress. Drawing on evidence from eight economies representing over three billion people, it offers domain-specific guidelines for clean energy, digital infrastructure, human capital, and institutional capacity, alongside implementation playbooks matched to three distinct constraint profiles. The goal is not another set of aspirational targets but an operational guide for turning existing solutions into universal living standards.