The underlying reason why trade benefits both sides of a trading arrangement is rooted in the concept of .

opportunity cost

Explanation:

The concept of Opportunity cost deals with the idea that individuals, investors, or business owners, due to scarcity of resources, lost possible benefits that could be gained, as he or she chooses alternative choice.

Hence, the underlying reason or factor trade benefits both sides of a trading arrangement is rooted in the concept of OPPORTUNITY COST.

Therefore, the right answer is Opportunity cost.

answer$225.00;