The country is also diversifying into diamond cutting and polishing as a way to add value to its extractive industry. Combined, these policies have contributed to macroeconomic stability and relatively improved poverty indicators. In Sierra Leone, the diamond sector has contributed little to human development, owing to different policy choices and challenges specific to the country. Such policies can be risky, as they affect investor confidence and can have adverse effects on markets and prices. The study on Nigeria’s oil sector describes the country’s attempt to establish deeper linkages with the national economy by stipulating that foreign oil extraction companies meet local content requirements in order to generate economic opportunities through focal procurement and promote local entrepreneurship.