Many investors are concerned about the economy's prognosis. Is there an investment that can withstand economic turmoil and provide returns for investors? Exchange-Traded Funds (ETFs) are popular among investors and professionals. On today's show, find out what ETFs are and learn:

• What are the underlying assets within ETFs?
• How do they trade?
• What are the costs involved?

Professor Donald J. Boudreaux of George Mason University explains why he is optimistic about the economy despite a nearly $20 trillion national deficit in the United States. He offers insight as to how increasing interest rates affect America's ability to pay its bills. Listen also to what Professor Boudreaux has to say about Nobel Prize winner Paul Krugman's economic views. Follow Professor Boudreaux on his blog at http://cafehayek.com