Answer:
frictional
structural changes.
Cyclical
frictional
Explanation:
Structural unemployment is an unemployment that occurs as a result of changes in the economy. These changes can be as a result of changes in technology, polices or competition . Structural unemployment tends to be permanent.
Frictional unemployment is the period of time a person is unemployed from the time he leaves his current job and the time he gets another job.
Cyclical unemployment occurs as a result of fluctuations in the economy. In a downturn unemployment is high and in a boom, unemployment is low.