technological steps
When I visited Kigali for 2 weeks in 2022, I observed a labour-capital ladder:
At the bottom, the poorest workers could earn a living by carrying fuel to and fro on foot.
Next, people with bicycles did the same thing faster.
If you saved enough from cycling, you could buy a motorcycle and become a mototaxi driver, providing transport for the city's middle class.
Taxi car drivers were on the next rung with air conditioning, personal space, and higher profits.

