If you're at all interested in this book, ignore Hoan Chau's review. How does Cowen know Mexicans enjoy the choices available at Wal-Mart? Simple, they shop there and keep it in business. You don't have to like Wal-Mart (I sure don't) to recognize that it doesn't coerce anyone into its store. In an impoverished country like Mexico, it brings in more goods at lower prices than were previously available, thus improving people's standard of living.
On creativity: Cowen isn't writing a philosophical treatise on creativity, so if he ignores the "external influences" on it, that's not a just criticism. But it's surprising that someone could read this book and miss the point: Cowen is arguing that the creativity of others is an external influence on an individual's creativity, so the value of global exchange is that our creativity is stimulated by contact with other country's cultural goods.
Consider the U.S. without Chinese or Mexican food (or, in my case, the nightmare of not having Thai food). Consider the U.S. without the influence of African music. No spirituals, no jazz or blues, no "Graceland" by Paul Simon. Consider how popular Jackie Chan is, not to mention the more respectable Chinese films such as "Crouching Tiger, Hidden Dragon." If you're more highbrow, consider the absence of Mozart or Paganini. Imagine no access to Sun Tzu's "The Art of War" or the Tao Te Ching, or the Boddhisatva.
In short, Cowen's point is that the global exchange of cultural goods enriches our lives. Efforts to restrict globalization will restrict the flow of these goods, impoverishing us all in ways that are hard to measure in dollar terms, but are easily understood in terms of cultural vivacity and creativity.
And, importantly, contrary to popular wisdom, America isn't exerting cultural hegemony--the Disneyfication of the world is overstated (easy to do when we have such jarring sights as a McDonalds jammed next to Beijing's Forbidden City. But other countries, including developing countries, export their cultural goods to the U.S. This increases the value of their cultural traditions, making it beneficial for people to hang onto them.
Remember, it's individual people (you and me) making these choices. We don't choose them unless we believe we're benefitting. And while we will make mistakes, it's a bit hard to believe that almost all our decisions almost all the time are actually harmful to us. It's even harder to believe that a small group of elites--whether in government or the self-appointed protectors of culture--will be able to make better choices for us. In short, this book is also an argument for preserving individual liberty.