I love it when two things connect. I'm really good at making those connections. Let's face it, with out me North America and South America would be such close friends. Who am I?

a treaty

Explanation:

when a country signs a treaty they make a bond

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.