According to Thomas Piketty capital investment depends on maintaining a labour surplus (see Piketty, T. , 2013, Capital in the twentyfirst century. (Harvard University Press, Cambridge, MA: ). Use the concept of dualism between the urban and the rural sector of an economy to explain this important concept. How does a theory of demographic transition can contribute to a labour surplus? (iii) The ILO document in https://www.ilo.org/wcmsp5/groups/public/---ed_emp/documents/publication/wcms_423613.pdf illustrates the following trends. Research the notion of "hukou", its effect on migrants' wellbeing and its real role in limiting workers' mobility