black economy
Noun
Meaning
a hidden sector of the economy where private cash transactions go unreported
Source: WordNetSynonyms
grey market
undeclared work
contrabandage
black budget
gray zone
grey economy
underground economy
casual employment
black work
extent of undeclared work
grey areas
illegal employment
illegal work
grey zone
illicit work
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Examples
no one knows how large the black economy really is