Answer: Natural unemployment
Step-by-step explanation:
Natural unemployment always exists even in a healthy economy this is because the people keep changing their jobs and they even leave the current job in search of the new ones. Natural unemployment also includes other types of unemployment such as seasonal, structural and frictional unemployment types.
Also some people might possess skills that are not necessary in the labor market. The natural unemployment is still in the economy even when there is technological advancement, industry expansion. New labor forces enter into market every year and people search jobs for better opportunities.