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Informal economy - Wikipedia
What Is the Informal Economy? - IMF
What is the informal economy and how many people work in it?
Five Things to Know about the Informal Economy - IMF
Informal Economy Database - World Bank Group
Statistics on the informal economy - ILOSTAT
The Long Shadow of Informality: Challenges and Policies - World Bank …
Informal economy - International Labour Organization
The Global Informal Economy: Large but On The Decline - IMF