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Introduction: What is informal activity? Part 1 The household sector: women's wages - unpaid household work and the national income accounts subsistence economics - the household in developing countries. Part 2 The informal sector: the informal sector - aid to development or barrier to modernization?, a safety valve for urban growth? Part 3 The irregular sector: the irregular sector - what is it and why does it matter? macroeconomic analysis of the irregular sector - how big is it, who is involved, how and where? perks, fiddles, fraud and the irregular sector the irregular sector in developing countries. Part 4 The criminal sector: organized crime in the developed countries crime in the developing countries.
Frey et al. (Sun,) studied this question.