如何区分cyclical unemployment,froctional unemployment,structural

Structural unemployment occurs when a labour market is unable to provide jobs for everyone who wants one because there is a mismatch between the skills of the unemployed workers and the skills needed for the available jobs
Frictional unemployment is the time period between jobs when a worker is searching for,or transitioning from one job to another.It is sometimes called search unemployment and can be voluntary based on the circumstances of the unemployed individual.
Cyclical or Keynesian unemployment,also known as deficient-demand unemployment,occurs when there is not enough aggregate demand in the economy to provide jobs for everyone who wants to work.
wiki呀 多权威 跟这耗什么劲

宏观经济学好好学，这个课件上讲的比较详细了！自己看看网上的资料就回了