during recessions the unemployment rate in our economy is usually quite high.?

Question

why is this difficult to explain using the classical model?
how could the keynesian model explain it ?

Answer 1

Classical economic assume the that markets find a equilibrium were supply equals demand including labor markets, so there can be no one who wants to work without a job, Keynes provided a mechanism that prevents this from happening.

Answer 2

The way the government reports unemployment is misleading.
It only shows people collecting benefits & seeking work.
Many have run out of benefits & given up seeking work.
Or they have settled for under-employment at minimum wage.