n.a hidden sector of the economy where private cash transactions go unreported

Black economy
Black Economy
Black Economic Progress After Myrdal
An expenditure-based estimate of Britain's black economy
Quantifying the Black Economy: ‘measurement Without Theory’ Yet Again?
Quantifying the Black Economy: ‘measurement Without Theory’ Yet Again?
Estimates of the black economy based on consumer demand approaches
An expenditure-based estimate of Britain's black economy
The Impact of Federal Civil Rights Policy on Black Economic Progress: Evidence from the Equal Employment Opportunity Act of 1972
Black Economic Power and Nation-Building in Post-Apartheid South Africa