In economics, labour (or labor) is a measure of the work done by human beings. It is conventionally contrasted with such other factors of production as land and capital. There are theories which have created a concept called human capital (referring to the skills that workers possess, not necessarily their actual work), although there are also counter posing macro-economic system theories that think human capital is a contradiction in terms. Types of labour:: * human capital * housework * manual labour * slavery * unfree labour * volunteer * wage slavery * wage labour source:: wikipedia.