Financing for development is not a cost, it is an investment. An investment in sustainable cities, quality education, access to healthcare, decent jobs, efficient and responsible agriculture, and ending extreme poverty. In 2015, we recognized that the size of the investment needed to achieve the UN’s Sustainable Development Goals is greater than aid alone can provide. The Addis Ababa Action Agenda called on both public and private actors to use aid, taxation, investment, remittances, philanthropy and innovative financing. This amounts to trillions of dollars in financing of all kinds, which needs to be targeted more strategically to where they are most needed.