Ms. Teresa Diaz, a Datera in Lima (cropped)

Ms. Teresa Diaz is a Datera in Lima, Peru. She collects records the times buses arrive at her stop, the number of passengers, and the number of people waiting. Diaz sells the data to bus drivers so that they can plan their routes accordingly. She works about 14 hours a day, six days a week, earning about $500.00 a month to support herself and her four children.

What do the day-to-day lives of individual people, like Ms. Diaz, say about the cities and societies in which they live?