How do “Micro-motives” relate to Global Politics?

Thomas Schelling introduced his book Micro-motives and Macro-Outcomes telling a story about a presentation he once gave. In the theatre where he spoke, lighting only allowed him to see the first few rows of seats, which were completely empty, leading him to conclude no one was in attendance. When the house lights came up, he could see the room was nearly full, with everyone seated in the area that appeared dark from the stage. Schelling notes that the front seats were equally accessible to attendees, but that each for their individual reasons—perhaps shared, perhaps different—led to people sitting closer to the back than to the front of the auditorium.
Schelling’s observation is consistent with the economic world view: individual transactions aggregate to larger outcomes in the market. Macro-economics is the study of the effects of the those individual transactions on the market as a whole, whereas micro-economics is the study of those transactions within individual cases.