This is a report emanating from a case study analysis by Aidspan of how The Global Fund’s willingness-to-pay policy leveraged additional government resources in the new funding model. The purpose of the study was to increase transparency around the Fund’s WTP policy, especially how it was operationalized at country level. The report provides quantitative and qualitative data on a small number of country case studies, detailing how much money countries committed as part of WTP, and what they committed to spend that money on. The study also describes how these commitments were obtained, including who participated in the process and any challenges which were encountered. Finally, the study describes how the WTP has contributed to spending on key populations, and how it impacted transition processes in upper-middle-income countries.