mutualism

noun3

1. •
   Any interaction between two species that benefits both; typically involves the exchange of substances or services.
2. •
   An economic theory and anarchist school of thought that advocates a society where each person might possess a means of production, either individually or collectively, with trade representing equivalent amounts of labor in the free market.
3. •
   The psychometric theory that general intelligence emerges from the interaction between specific cognitive abilities.