The GIIN’s report “Sizing the Impact Investing Market 2024” (Dean Hand, Maddie Ulanow, Hongyu Pan, Kelly Xiao; Oct 23, 2024) is included as a foundational, data-driven reference for Part 2’s Impact Investment chapter and the book’s “Explore the Landscape” section because it quantifies the market ($1.571 trillion AUM managed by ~3,907 organizations, with a 21% CAGR since 2019), profiles investor types, documents that most impact investors meet or exceed financial and impact expectations, and emphasizes the accelerating momentum and urgent need to channel capital toward the SDGs—making it an authoritative resource cited in the Appendix Resources to ground the book’s guidance on building values-led, impact-focused portfolios.