A national portfolio refers to a collection or group of assets, resources, and investments that are owned by a country. It can include physical assets such as infrastructure, natural resources like land and minerals, financial assets such as stocks, bonds, and other securities, human capital such as skilled labor force, and intangible assets such as intellectual property rights. The national portfolio represents the wealth of a country and is an important indicator of its economic strength and growth potential. It can also be used to measure the overall performance of a nation's economy by comparing it with other countries or over time.