The sun gleamed through the window of Sonia Headlee’s office in the rural region of Kano, Nigeria. She tried to appreciate the blue sky, but she was desperate for the rainy season to begin. Her fields needed the water. This was just one of the hurdles she’d encountered since starting Inganci Tumatir three years earlier.

A version of this article appeared in the March–April 2020 issue of Harvard Business Review.