What is another name used for the 'underground economy'?

Name: What is another name used for the 'underground economy'?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The term "underground economy" is often used to describe economic transactions that are hidden and not reported to authorities, while "informal sector" refers to economic activities that are not regulated or monitored by the government. Therefore, B) Informal sector is the best choice for another name used for the 'underground economy'.

What Is Another Name Used for the 'Underground Economy