Page "Labour economics" Paragraph 17
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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:
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