Unemployment is inherently a source of social unrest since it concerns the citizens of a given nation very directly.

unrest 由前缀 un-（表示"否定"）和 rest（"休息、安宁"）组成，字面意思是"不安宁的状态"，引申为"动荡、骚乱"。在句中指社会层面的不稳定状态。