Medicare is a social insurance program that serves more than 44 million enrollees (as of 2008). The program costs about $432 billion, or 3.2% of GDP, in 2007.
The definition of an institution is an established custom or practice, or a group of people that was formed for a specific reason or a building that houses the group of people. 1  Marriage is an example of a cultural institution. 2  A town council is an example of an institution of government.
Institutions are stable, valued, recurring patterns of behavior. As structures or mechanisms of social order, they govern the behaviour of a set of individuals within a given community. Institutions are identified with a social purpose, transcending individuals and intentions by mediating the rules that govern living behavior. The term institution commonly applies to both informal institutions such as customs, or behavior patterns important to a society, and to particular formal institutions created by entities such as the government and public services. Primary or meta-institutions are institutions such as the family that are broad enough to encompass other institutions.