The report titled 'Financing the UN Development System: Time for Hard Choices' discusses the financial landscape and trends affecting the UN's resource flows, emphasizing the need for strategic decision-making in funding allocations. It notes a revenue increase to $53.2 billion in 2017, driven by new entities, growth from existing UN bodies, and highlights challenges in financial data quality. The document features contributions from various experts and outlines the urgency for a multilateral approach to meet sustainable development goals amid complex global challenges.