"mutual gains" is correct and usable in written English.
You can use it when referring to mutually shared profits or gains between two parties. For example, "The two companies agreed to a deal that would result in mutual gains for both sides."
Could there have been any mutual gains?
Huge mutual gains in energy co-operation are to be had if only the two countries were serious about achieving them.
Environmental Econ 101 If there's a single central insight in economics, it's this: There are mutual gains from transactions between consenting adults.
Those who think there is an incentive for countries to 'free-ride' on the climate protection provided by others are very much mistaken," says Green. "Countries should see the climate talks in Paris this December as an opportunity to work with each other to deliver as quickly as possible the mutual gains that can result from decarbonising the economy".
The mutual gains from trade do not depend upon lines drawn on a map.
Coordination problems occur when two or more parties can realize mutual gains by making the right set of decisions, but everyone may be worse off if the group fails to coordinate.
Mutual gain is another aspect of domestication.
Successful business dealings are rooted in substantive exchanges and mutual gain.
Does Barack Obama's America have the patience and confidence to welcome this change, harnessing it for mutual gain?
Communication is pointless in constant-sum games because there is no possibility of mutual gain from cooperating.
China advertises these programmes as a kind-hearted diplomatic gesture – the terms "equality", "all-round co-operation" and "mutual gain" pepper its state media reports and programme descriptions.
