/ˈʌndərˌɡraʊnd ɪˈkɑnəmi/ – Phrase
Definition: nền kinh tế ngầm (trái phép, phạm pháp).
A more thorough explanation: The underground economy refers to economic activities that are conducted outside the purview of government regulation, taxation, or oversight. This includes transactions that are not reported to authorities, often involving cash payments and informal agreements.
Example: The underground economy refers to economic activities that are conducted outside the purview of government regulation and oversight, such as unreported income from illegal activities.