Which form of unemployment persists even when wages are at their competitive equilibrium level?

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Joblessness caused by labor unionsUnemployment resulting from efficiency wage policiesFrictional unemploymentUnemployment driven by minimum wage regulations

Explanation

Unemployment caused by unions, efficiency wages, or minimum wage laws typically arises when wages deviate from the competitive equilibrium. However, frictional unemployment occurs naturally as workers transition between jobs, and it exists even when wages are at competitive equilibrium.