Some cool Secondary Market, images:

Groundnuts for sale at a market near Khulungira Village, in central Malawi
Secondary Market,
Image by ILRI
Khulungira is a village of about 150 families in central Malawi, 27 km from the nearest paved road and 50 km from the nearest town. There is no electricity and no running water. No one here owns a car or a motorcycle. Few parents can afford to send their children to secondary school. Groundnuts are an important crop here (photo credit: ILRI/Mann).

SeatGeek demos how it forecasts ticket prices for sports and concerts on the secondary market at #TC50.
Secondary Market,
Image by Frank Gruber