Tyler Cowen of George Mason University and author of the e-book The Great Stagnation talks with EconTalk host Russ Roberts about the ideas in the book. Cowen argues that in the last four decades, the growth in prosperity for the average family has slowed dramatically in the United States relative to earlier decades and time periods. Cowen argues that this is the result of a natural slowing in innovation and that we expect too much growth relative to what is possible. Cowen expects improvements in the rate of growth in the future when new areas of research yield high returns. The conversation includes a discussion of the implications of Cowen's thesis for politics and public policy.