Volume III of a three-volume research compendium covering AI's economic impacts across 25 topic areas. This volume contains Reports 16–25, extending the analysis into systems-level infrastructure, future-oriented domains, and emerging sectors. 660 KB across 10 research files — ~481 footnoted citations — 86,225 words — 50 topic areas. Reports included:16: AI and Transportation, Autonomous Vehicles, Logistics, and Mobility Systems (autonomous vehicles, logistics/supply chain, MaaS, transportation safety, labor/equity)17: AI in Manufacturing, Industry 4.0, and Smart Factories (smart factories, predictive maintenance, cobots, reshoring, manufacturing labor)18: AI in Government Services, Public Administration, and Democratic Governance (government services, public safety, democratic governance, procurement/ethics, public workforce)19: AI and Retail, E-Commerce, Consumer Behavior, and the Consumer Economy (retail AI, personalization, retail labor, food service, consumer protection)20: AI, Demographics, and Workforce Futures (aging populations, immigration/talent flows, future of work scenarios, inequality, education pipeline)21: AI and Scientific Discovery, R&D, and the Transformation of the Scientific Method (drug discovery, materials science, weather/climate modeling, scientific method, reproducibility)22: AI and Insurance, Actuarial Science, and Risk Management (insurtech, actuarial AI, claims automation, cyber insurance, systemic risk, regulation)23: AI and Media, Journalism, Information Integrity, and the Attention Economy (news automation, information integrity, attention economy, copyright, content licensing)24: AI and Environment, Biodiversity Conservation, Natural Resource Management, and the Mining-Hardware Nexus (conservation monitoring, wildfire prediction, data center footprint, mining nexus, climate modeling)25: AI and Entrepreneurship, Small Businesses, the Startup Ecosystem, and the Solopreneur Economy (solopreneur economy, startup ecosystem, SMB adoption, equity gaps, venture capital) Cross-cutting findings: (1) Physical infrastructure is AI's binding constraint. (2) The "barbell economy" is emerging — AI benefits very large and very small firms while hollowing mid-sized enterprises. (3) AI is restructuring information trust across journalism, science, and government. (4) Demographic headwinds make AI adoption non-optional. (5) The environmental cost-benefit remains unresolved. Companion to Volume I (DOI: 10.5281/zenodo.19004727) and Volume II (DOI: 10.5281/zenodo.19012877).