what are the four characteristics of labour?
['Labour is Perishable: ... ', 'Labour cannot be separated from the Labourer: ... ', 'Less Mobility of Labour: ... ', 'Weak Bargaining Power of Labour: ... ', 'Inelastic Supply of labour: ... ', 'Labourer is a Human being and not a Machine: ... ', 'A Labourer sells his Labour and not Himself: ... ', 'Increase in Wages may reduce the Supply of Labour:']