Dr. William (Bill) Bernstein is a retired neurologist, author, investment adviser, and financial historian. His research is in the field of modern portfolio theory and economic history. Bill has published extensively on investing and economic history, including eight books and numerous articles. He holds a Ph.D. and an M.D. Bill is a repeat guest, first appearing in Episode 13. In this episode, we discuss Treasury Inflation Protected Securities (TIPS), asset allocation in today's uncertain world, four deep risks, and the cost of income inequality.     This podcast is hosted by Rick Ferri, CFA, a long-time Boglehead and investment adviser. The Bogleheads are a group of like-minded individual investors who follow the general investment and business beliefs of John C. Bogle, founder and former CEO of the Vanguard Group. It is a conflict-free community where individual investors reach out and provide education, assistance, and relevant information to other investors of all experience levels at no cost. The organization supports a free forum at Bogleheads.org, and the wiki site is Bogleheads® wiki.    Since 2000, the Bogleheads' have held national conferences in major cities around the country. There are also many Local Chapters in the US and even a few Foreign Chapters that meet regularly. New Chapters are being added on a regular basis. All Bogleheads activities are coordinated by volunteers who contribute their time and talent.     This podcast is supported by the John C. Bogle Center for Financial Literacy, a non-profit organization approved by the IRS as a 501(c)(3) public charity on February 6, 2012. Your tax-deductible donation to the Bogle Center is appreciated.