Labour supply refers to the amount of labour that are willing to offer corresponding to a particular wage rate. It changes in response to change in wage rate. On the other hand, labour force refers to the number of people who are able to work and willing to work at the existing wage rate.

Worker-population ratio may be defined as the total number of workers divided by population. It is expressed in percentage.

A formal sector is that sector which consists of all public sector establishments, government establishments and private sector establishments hiring ten or more workers. Formal sector employees have better earnings and higher standard of living.

Informalisation of employment refers to a situation when people tend to find employment more in un-organised (or informal) sector of the economy and less in organised (formal) sector of the economy.

Self-employed means engaging in one's own business or profession. Self-employed workers do not sell their services to others. They are their own masters.