Nearly forty percent of humanity lives on an average of two dollars a day or less. If you've never had to survive on an income so small, it is hard to imagine. How would you put food on the table, afford a home, and educate your children? How would you handle emergencies and old age? Every day, more than a billion people around the world must answer these questions.

Portfolios of the Poor is the first book to systematically explain how the poor find solutions to their everyday financial probl...