sentences:  As documented extensively by Hernando de Soto and others, even if they happen to own land in the developing world, they may not have effective title to it.To address this problem, Schulze's credit unions introduced the concept of the bond of association.This type of bond, which drew on informal systems of lending like ROSCAs, was developed fully in Raiffeisen's village credit unions, helping to reduce the costs and risks of lending to people of good character but limited means.