The document discusses key constraints facing seed sector development in agriculture, including scarcity of early generation seed supply, low capacity of seed companies and research institutions, lack of financing for the seed value chain, and lack of farmer awareness. It provides recommendations to governments and donors to address economic constraints through various approaches depending on the level of public versus private sector involvement, such as removing market distortions, mitigating demand risk, driving public sector efficiency, and subsidizing production costs. Examples of seed scaling projects in different countries demonstrate strategies to promote adoption of improved seeds through activities like marketing campaigns, quality seed production training, and community-based seed production models.