The article explains how different types of productivity shocks affect job separation and job destruction rates in Korea. A shock in matching productivity can lead to worker-firm separations without destroying jobs, while a shock in potential productivity can cause both separations and job losses. When the variability of matching productivity shock decreases and potential productivity shock remains stable, job separation and unemployment rates decrease, while job destruction rate stays the same. This model aligns with the observation that job destruction rate was steady in Korean mining and manufacturing, while job separation and unemployment rates decreased in the 1980s and 1990s.