Mutualism

Mutualism is an interaction between two or more species, where both species derive benefit. Most people would view this as a benefit and a good thing but this is not always the case. Two species that benefit each other generally cause a direct expense to a third party. Predation tends to stabilize economy, while mutualism can sometimes destabilize them. Predators keep their prey's numbers under control, but mutualism can give a group of species an edge on those around them and affect the ecosystem in a negative way. To give an example Germany, Italy and Japan did more to destroy the earth, than Germany on its own. One more common example that tends to affect children is the mutualistic relationships of two older sibblings ganging up on the youngest sibbling. The two older children will tend to egg each other on and create more harm than just one.