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Matthew Yglesias, author of "One Billion Americans: The Case for Thinking Bigger."

There are roughly 330 million people living in the United States, but Matthew Yglesias says adding a whole lot more would be a whole lot better for the country.

Yglesias is author of the new book, "One Billion Americans: The Case for Thinking Bigger."  The Show spoke with him recently and asked exactly how many more people he thinks need to call the U.S. home.

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