(i) Inseparable from the body of the worker : Labour and his work always goes together. Hence, labourer must present himself where he suppose to render his services.

(ii) Human and active factor of production : Labour being a human factor has feelings, likes and dislikes. Therefore, he cannot be treated as a machine. Other factors become productive only after the application of labour. So, labour is the most active factor of production.

(iii) Labourer sells his labour and not himself : As quoted by Alfred Marshall, “the worker sells his labour, but he himself remains his own property,” The worker does not sell himself. He sells his labour only.

(iv) Restricted mobility : According to Adam Smith, “Of all the luggage’s, the labour is the most difficult to be transported.” Labour can move from one country to another country in the same way. Labour can change his business easily, but due to the family attachment, housing problems, climate etc., restricts geographic mobility of labour.