Interdependence is the mutual reliance between two or more groups. This concept differs from the reliance in a dependent relationship, where some members are dependent and some are not. There can be various degrees of interdependence.
In an interdependent relationship, participants may be emotionally, economically, ecologically and/or morally reliant on and responsible to each other. An interdependent relationship can arise between two or more cooperative autonomous participants (e.g. a co-op). Some people advocate freedom or independence as the ultimate good; others do the same with devotion to one's family, community, or society. Interdependence can be a common ground between these aspirations.
Authors and leaders have written and spoken about interdependence throughout history, including Karl Marx, Mahatma Gandhi, Franklin Delano Roosevelt and Stephen Covey. Karl Marx first used the term interdependence in the Communist Manifesto (1848) in describing the universal interdependence of nations in comparison to the old local and national seclusion of independence and self-sufficiency.
The various classical civilizations over the ages established vast trading networks with one another. The exchange of goods and ideas occurred from the time of the early Indian Empire on the Indus River, all the way up to the Roman Empire on the Mediterranean.
Today, international interdependence is often said to be strong and to have increased. International trade is taken to be an indicator of interdependence, and its high and, with some interruptions, rapidly growing values are accepted as evidence of the increasing interdependence of nations. Between 1820 and 1992, world population increased 5-fold, income per head 8-fold, world income 40-fold, and world trade 540-fold. Sometimes international financial flows are taken as the measure of interdependence.