Many different terms are used: underground, shadow, non-observed, hidden etc. No universal agreement on exactly what those terms cover or how they differ.
@theGEDInstitute
“The application of big data, new algorithms and cloud computing is creating a global digital platform economy built around platform companies.”
@WorldBank
“Women, Business and the Law 2021 is the seventh in a series of annual studies measuring the laws and regulations that affect women’s economic opportunity in 190 economies.”
Australia🇦🇺: 16.1
Brazil🇧🇷: 21.2
Canada🇨🇦: 18.3
France🇫🇷: 11.1
Germany🇩🇪: 15
India🇮🇳: 34
Indonesia🇮🇩: 41.6
Italy🇮🇹: 13.5
Japan🇯🇵: 24
Korea🇰🇷: 23.4
Mexico🇲🇽: 29
Russia🇷🇺: 22.3
S. Africa🇿🇦: 22.4
Spain🇪🇸: 14.3
Turkey🇹🇷: 25.1
UK🇬🇧: 17.5
USA🇺🇸: 17.9
“The OECD Social Institutions and Gender Index series analyses how formal and informal laws, social norms and practices discriminate on the basis of gender and helps governments and development practitioners identify policies and programmes to tackle this discrimination.”