地ち下か経けい済ざい

noun

underground economy; black economy

Refers to economic activities that are unreported, untaxed, or illegal, often contrasted with the formal economy.

• 地ち下か経けい済ざいの規き模ぼを正せい確かくに測はかるのは難むずかしい。

  It is difficult to accurately measure the size of the underground economy.

• 麻ま薬やく取とり引ひきは地ち下か経けい済ざいの一いち部ぶだ。

  Drug trafficking is part of the black economy.