Archaeologists have discovered the ruins of an 800-year-old Aztec pyramid in the heart of Mexico City that could show the ancient city is at least a century older than previously thought.

Scattered throughout Mexico, you'll find the ruins of several ancient civilizations, including those of the Aztec, Maya and Toltec people. Many of these sites feature impressive pyramids standing ...

Chu, Michael, and Regina Garcia-Cuellar. "Farmacias Similares: Private and Public Health Care for the Base of the Pyramid in Mexico." Harvard Business School Case 307-092, January 2007. (Revised April ...