Critics say Americans are obsessed with buying stuff we don�t need, costing us our values and our environment. But it�s consumer spending that fuels the U.S. economy, and President Bush says to get out and shop. Trish talks with Thomas Naylor, author of �Affluenza: The All Consuming Epidemic�, and professor emeritus of economics at Duke University, www.duke.edu, and Craig Thompson, assistant professor of marketing at University of Wisconsin www.wisc.edu.