Where did the $225 million or more generated between March 2009 and December 2019 by the Go-Pass go? It's hard to get a clear picture today of how the fee, officially called the Infrastructure Development Fund (Idef), was used. For the past 12 years, the Idef was established to provide the financially unbalanced Congolese Airways Authority (Régie des voies aériennes, RVA) with the necessary funds to develop the country's airport infrastructure.

Where people live exerts a strong influence on multiple aspects of their well-being, including their access to economic opportunities, education, health and other services and to their security, as well as other goals envisioned in the 2030 Agenda for Sustainable Development. In a world with high and growing levels of urbanization, policy makers are increasingly aware that the future of inequality depends largely on what happens in cities. There is also concern that rising spatial inequality can lead to social unrest, rioting, increased crime, and erode trust among separated societal groups.