Financial Thought Exchange Podcast

Roger G. Ibbotson, PhD, and Laurence B. Siegel join Lotta Moberg, PhD, CFA, to continue their discussion of Exponential Wealth: Centuries of Stock and Bond Returns, a forthcoming CFA Institute Research Foundation book. This conversation focuses on the construction of long-run stock and bond market indices and the challenges of measuring returns across centuries of financial history. Ibbotson and Siegel examine index methodologies, including market capitalization weighting, equal weighting, and free-float adjustments, and discuss what investors can learn from historical data about concentration, volatility, survivorship bias, and the small-cap premium. The conversation also explores the book's international perspective, drawing on centuries of market data from around the world to provide context for capital market forecasts and long-term investment decisions. Exponential Wealth is a 21-chapter compendium of data, insights, and essays by 24 distinguished authors on stock and bond markets. . The book is organized into four sections covering stock and bond return history, the past 100 years in US markets, centuries of US and global returns, and forecasts for the future. Topics include index construction, equity risk premiums, bubbles and crashes, commodities, global market history, and forecasting. Contributing authors include David Chambers, Peng Chen, Thomas Coleman, Fernando de la Luz Reyes, Elroy Dimson, William N. Goetzmann, James Harrington, Thomas Idzorek, Antti Ilmanen, Rajkumar Janardanan, Paul Kaplan, Tadaaki Komatsubara, Otto Manninen, Paul Marsh, Edward McQuarrie, Carla Nunes, Xiao Qiao, Paul Rintamäki, Geert Rouwenhorst, Mike Staunton, Bryan Taylor, and James Tyler. Related content and publications: Exponential Wealth: Centuries of Stock and Bond Returns with Ibbotson and Siegel (Part 1)https://youtu.be/wyVlpZQ6qc4 The Long-Run Drivers of Stock Returns: Total Payouts and the Real Economyhttps://rpc.cfainstitute.org/research/financial-analysts-journal/2017/the-long-run-drivers-of-stock… Financial Thought Exchange with Rob Arnott, Part 1https://www.youtube.com/watch?v=ox7-y7PZ_ek Financial Thought Exchange with Rob Arnott, Part 2https://www.youtube.com/watch?v=ShaI1N1BrEM Stocks, Bonds, Bills, and Inflation® (SBBI®): 2020 Summary Editionhttps://rpc.cfainstitute.org/research/foundation/2020/sbbi-2020-summary-edition Stocks, Bonds, Bills, and Inflation: Historical Returns (1926–1987)https://rpc.cfainstitute.org/research/foundation/1989/rf-v1989-n3-sbbi-historical-returns Stocks, Bonds, Bills, and Inflation: The Past and the Future, 1982 Edition

Roger G. Ibbotson, PhD, and Laurence B. Siegel join Lotta Moberg, PhD, CFA, to discuss Exponential Wealth: Centuries of Stock and Bond Returns, a forthcoming CFA Institute Research Foundation book. Marking the 50th anniversary of Ibbotson’s landmark research on stocks, bonds, bills, and inflation, the conversation examines what more than 100 years of market data reveal about long-term wealth creation. Ibbotson and Siegel explore the power of compounding, the importance of total returns and dividend reinvestment, the relationship between market returns and economic growth, and how investors should interpret a century of evidence on stocks, bonds, and inflation.Exponential Wealth is a 21-chapter compendium of data, essays, and insights on stock and bond markets. The book is organized into four sections covering stock and bond return history, the past 100 years in US markets, centuries of US and global returns, and forecasts for the future. Topics include index construction, equity risk premiums, bubbles and crashes, commodities, global market history, and forecasting.Contributing authors include David Chambers, Peng Chen, Thomas Coleman, Fernando de la Luz Reyes, Elroy Dimson, William N. Goetzmann, James Harrington, Thomas Idzorek, Antti Ilmanen, Rajkumar Janardanan, Paul Kaplan, Tadaaki Komatsubara, Otto Manninen, Paul Marsh, Edward McQuarrie, Carla Nunes, Xiao Qiao, Paul Rintamäki, Geert Rouwenhorst, Mike Staunton, Bryan Taylor, and James Tyler.Related content and publications:The Long-Run Drivers of Stock Returns: Total Payouts and the Real Economyhttps://rpc.cfainstitute.org/research/financial-analysts-journal/2017/the-long-run-drivers-of-stock…Financial Thought Exchange with Rob Arnott, Part 1https://www.youtube.com/watch?v=ox7-y7PZ_ekFinancial Thought Exchange with Rob Arnott, Part 2https://www.youtube.com/watch?v=ShaI1N1BrEMStocks, Bonds, Bills, and Inflation® (SBBI®): 2020 Summary EditionSBBI 2020 Summary Edition |Stocks, Bonds, Bills, and InflationStocks, Bonds, Bills, and Inflation: Historical Returns (1926–1987)https://rpc.cfainstitute.org/sites/default/files/-/media/documents/book/rf-publication/1989/rf-v198…Stocks, Bonds, Bills, and Inflation: The Past and the Future, 1982 EditionStocks, Bonds, Bills,& Inflation: 1982 Edition | RPC

Rob Arnott joins Lotta Moberg, PhD, CFA, to continue their conversation on indexing, focusing on how index construction decisions shape outcomes for investors. Arnott examines the hidden effects of index membership, including how inclusion can influence valuations and create structural buying pressure, and why traditional market‑cap approaches may embed unintended biases. He introduces alternative approaches such as fundamental indexing, explaining how weighting by economic size rather than price can change portfolio behavior and return profiles. The discussion also explores turnover, momentum, IPO dynamics, and practical ways to think differently about benchmarks and passive investing. Arnott offers a perspective that challenges conventional definitions of "passive," encouraging a more critical view of how indices are built and used.

Rob Arnott joins Lotta Moberg, PhD, CFA, to discuss the ideas behind The Active Side of Indexing and challenge common assumptions about passive investing. Arnott explains why traditional market‑cap indices are not as passive as they appear, highlighting how index construction and rebalancing can lead to systematically buying high and selling low. The conversation examines the impact of index inclusion and deletion, turnover dynamics, and overlooked trading costs, as well as the implications for long‑term performance. Arnott also explores momentum, mean reversion, and the growing influence of index funds on market structure, offering a fresh perspective on how investors should think about benchmarks, efficiency, and the relationship between active and passive strategies.

Petter Kolm, PhD, and Gordon Ritter, PhD, join Lotta Moberg, PhD, CFA, to continue their discussion on quantitative investing, focusing on model design, implementation, and real‑world application. The conversation explores how quantitative strategies are refined in practice, the challenges of working with financial data, and the balance between theoretical rigor and practical constraints. Kolm and Ritter also discuss evolving market conditions, sources of edge, and how practitioners can think critically about models, performance, and risk. The discussion highlights the importance of adaptability and disciplined decision‑making when applying quantitative approaches in dynamic markets.