How is CVS not a monopoly??

Just curious to see thoughts here. With every acquisition, I seriously wonder how the government can allow CVS to continue without being considred a monopoly? Is it really ethical to have one company own a large majority of the nation's pharmacy locations (and keep buying up more and more little guys along the way), but then also be Caremark/ESI and acquire Aetna? What loopholes is this satanic company using? The persuasion of $$$ ?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pharmacy Source Type: forums