in every area and on every level
A formal, somewhat literary compound used to emphasize that something applies across all sectors and strata of society, such as in political or economic contexts.
各界各層の意見を聞く必要がある。
We need to hear opinions from every field and every level.
Compound of 各界 (kakkai, 'various fields') and 各層 (kakusō, 'various levels/strata').