A definition of individual capital making only operational distinctions was proposed by Craig Hubley in 1999 and subsequently released by the ECG under CC-by-nc-noderivs. Individual capital is sometimes called human capital but doing so obscures the critical role of social and instructional capital. In classical economics individual capital is labour.
However, modern analyses, especially in green economics, have recognized that several types of capital asset exist with very different characteristics than those assumed in classic economics for labour, and that labour, or talent, requires specific inputs and has special needs other assets don't. For instance, to rest, an issue studied closely by Acquisti and Baldassari.