Both CVS and Walgreens are publicly traded corporations, owned by stock holders across the globe. They both are managed by a CEO; Larry Merlo is the CEO of CVS Caremark Larry Merlo - Wikipedia. read more
The Walgreen Company (or simply Walgreens) is an American company that operates as the second-largest pharmacy store chain in the United States behind CVS Health. It specializes in filling prescriptions, health and wellness products, health information, and photo services. read more
If a customer is not fully satisfied by what Walgreens has, and the CVS store is nearby, some customers will check CVS; if CVS is far away, customers will accept what Walgreens has for sale. CVS and Walgreens also commonly locate near large grocery stores. read more