Labour Economics, is the study of labour force as an element in the process of production. The labour force comprises all those who work for gain, whether as employees, employers, or as self-employed, and it includes the unemployed who are seeking work. Labour economics involves the study of the factors affecting the efficiency of these workers, their deployment between different industries and occupations, and the determination of their pay. In developing models for the study of these factors, this section deals with the labour force of contemporary industrialized economies. Labour Economists have the responsibility of collecting and analyzing data in order to prepare reports and formulate plans to address economic problems related to the labour market. Labour Economics seeks to understand the functioning and dynamics of the markets for wage labour. Labour markets function through the interaction of workers and employers. Labour economics looks at the suppliers of labour services (workers), the demands of labour services (employers), and attempts to understand the resulting pattern of wages, employment, and income. Labour Economist job duties includes to collect and analyze data related to labour and employment markets, prepare reports which explain certain phenomena within labour economics. They also determine the potential impacts of new public policies, such as proposed legislation, taxes, services, and regulations and testify as an expert witness at regulatory or legislative hearings concerning the estimated effects of changes in legislation or public policy, futher they present recommendations based on cost-benefit analysis.