While militaries fight over territories, waters, and air space, firms compete over markets, which can be geographic or technological in nature. In the 21st century, protectionist trade wars based on antitrust policy (antitrust wars) have become a common. The antitrust wars discussed in this case are a result of which of the following?
a. Coordination
b. Tacit collusion
c. Sphere of influence
d. Competitive dynamics