Here are some good articles and reports for further reading:
UNECA: Africa could earn $ 99 billion a year by improving its tax revenues (in french). March 25, 2019.
Tax reform, digitization key to financing Africa’s development – UNECA report. March 23, 2019.
McKinsey podcast. How to win Africa. November 2018
Afrique Le Point: Secteur informel : le numérique au secours des recettes des États? June 9, 2018.
More than 61 per cent of the world’s employed population – two billion people – earn their livelihoods in the informal sector, the United Nations labour agency said, stressing that a transition to the formal economy is critical to ensure rights’ protection and decent working conditions. Women and men in the informal economy: A statistical picture 2018
Le Point Afrique "Afrique : le secteur informel fait sa révolution". Viviane Forson. July 18, 2017.
IMF Working Papers: The Informal Economy in Sub-Saharan Africa : Size and Determinants. Leandro Medina, Andrew W Jonelis, Mehmet Cangul. July 10, 2017
The Power of the Poor - Full Video (YouTube). Dec 30, 2015.
Informal Sector In Francophone Africa: Firm Size, Productivity, And Institutions (PDF), 2012 • N. Benjamin, A. A. Mbaye, I. A. T. Diop, Stephen S. Golub, D. Haughton. 2012The free market secret of the Arab revolutions, Financial TImes, Hernando de Soto, November 8, 2011