किस प्रकार की बेरोजगारी में श्रमिकों की सीमांत उत्पादकता (marginal productivity) शून्य होती है?

A situation in which more people are employed in a job than are actually required is termed as ______.

Frictional unemployment is defined as unemployment caused by:

The Great Depression of 1930 primarily caused which type of unemployment?