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It is an important subject because unemployment is a problem that affects the public most directly and severely. Full employment (or reduced unemployment) is a goal of many modern governments.
There are two sides to labour economics. Labour economics can generally be seen as the application of microeconomic or macroeconomic techniques to the labour market. Microeconomic techniques study the role of individuals in the labour market. Macroeconomic techniques look at the interrelations between the labour market, the goods market, the money market, and the foreign trade market. It looks at how these interactions influence macro variables such as employment levels, participation rates, aggregate income and Gross Domestic Product
The labour force is defined as the number of people employed plus the number unemployed but seeking work. The participation rate is the number of people in the labour force divided by the size of the adult population (or by the population of working age ). The unemployment level is defined as the labour force minus the number of people currently employed. The unemployment rate is defined as the level of unemployment divided by the labour force. The employment rate is defined as the number of people currently employed divided by the adult population (or by the population of working age). In these statistics, self-employed people are counted as employed.
Variables like employment level, unemployment level, labour force, and unfilled vacancies are called stock variables because they measure a quantity at a point in time. They can be contrasted with flow variables which measure a quantity over a duration of time. Changes in the labour force are due to flow variables such as natural population growth, net immigration, new entrants, and retirements from the labour force. Changes in unemployment depend on: inflows made up of non-employed people starting to look for jobs and of employed people who lose their jobs and look for new ones; and outflows of people who find new employment and of people who stop looking for employment.
When looking at the overall macroeconomy, several types of unemployment have been identified, including:
Economists see the labour market as similar to any other market in that the forces of supply and demand jointly determine price (in this case the wage rate) and quantity (in this case the number of people employed).
However, the labour market differs from other markets (like the markets for goods or the money market) in several ways. Perhaps the most important of these differences is the function of supply and demand in setting price and quantity. In markets for goods, if the price is high there is a tendency in the long run for more goods to be produced until the demand is satisfied. With labour, overall supply cannot effectively be manufactured because people have a limited amount of time in the day, and people are not manufactured. A rise in overall wages will, in many situations, not result in more supply of labour: it may result in less supply of labour as workers take more time off to spend their increased wages, or it may result in no change in supply. Within the overall labour market, particular segments are thought to be subject to more normal rules of supply and demand as workers are likely to change job types in response to differing wage rates.
Many economists have thought that, in the absence of laws or organisations such as unions or large multinational corporations, labour markets can be close to perfectly competitive in the economic sense — that is, there are many workers and employers both having perfect information about each other and there are no transaction costs. The competitive assumption leads to clear conclusions — workers earn their marginal product of labour.
Other economists focus on deviations from perfectly competitive labour markets. These include job search, training and gaining-of-experience costs to switch between job types, efficiency wage models and oligopsony / monopsonistic competition.
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