Bonus Episode: Elroy Dimson - The Evolution of Equity Markets

Episode Summary

Executive Summary: This bonus episode promotes The Best Investment Writing, Volume 2 and features Elroy Dimson reading a chapter on the evolution of equity markets. Drawing on the Global Investment Returns Yearbook, he argues that long-term, cross-country history is essential to understanding risk and return, because markets rise, fall, and sometimes disappear. His central conclusion: avoid country-picking and market timing; instead, hold a globally diversified equity portfolio.

Main Topics: Book promotion and charitable proceeds (Priority: 2/5): The episode introduces the second volume of The Best Investment Writing, highlights its expanded selection of 41 articles, and notes that writer proceeds go to charity. The value of long-run market history (Priority: 5/5): Dimson explains that understanding risk and return requires studying long periods because equity returns are volatile and country outcomes differ dramatically over time. Scope and authority of the Yearbook database (Priority: 5/5): He describes the Global Investment Returns Yearbook as a long-run dataset covering annual returns across major asset classes in 23 countries plus regional indexes, establishing it as a key source for global market history. Survivorship bias and success bias (Priority: 5/5): Dimson warns that omitting failed markets or overemphasizing winners distorts conclusions, and he discusses adding Russia, China, Austria-Hungary, and Portugal to reduce bias. Shifting global market leadership (Priority: 4/5): The talk traces the transition from UK dominance in 1900 to US dominance today, with Japan briefly becoming the largest market around 1990 before declining sharply. Investment lesson: diversification over country picking (Priority: 5/5): The chapter closes with a practical takeaway: market timing and concentrated country bets are risky, while global diversification is the safer strategy.

Key Arguments: Long-term history is necessary because equity returns are highly volatile and short samples can mislead investors. The Yearbook’s global dataset provides unusually broad and reliable evidence on stocks, bonds, bills, inflation, and currencies across countries. Survivorship bias can overstate returns if failed markets are excluded; Russia and China are essential examples of market collapse. Success bias is also dangerous because focusing on only the most successful market, especially the United States, creates a misleading view of what investors can expect. Adding weaker or failed markets such as Austria-Hungary and Portugal improves the realism of global return estimates. The United States became dominant through strong economic performance, IPO activity, and equity returns, but its historical success should not be generalized to all markets. For most investors, the best response to uncertain country fortunes is a globally diversified equity portfolio rather than country selection or market timing.

Data Points: Number of investment articles in Volume 2: 41 - The new edition is described as expanded to include 41 hand-selected articles. Countries covered in database: 23 countries - The Global Investment Returns Yearbook database tracks annual returns across 23 countries. Regional indexes: 3 regional indexes - Includes a 23-country world index, a 22-country world ex-USA index, and a 16-country Europe index. Time span of returns data: 1900 to 2018 - Annual returns are documented from 1900 through 2018. Countries with complete 118-year history: 21 countries - After accounting for market closures and reconstructing returns, 21 countries have a complete 118-year record. Countries making up global investable universe in 2018: 91% - The 23 countries represented about 91% of the investable universe at the start of 2018. Coverage of global equity markets at start of 1900: almost 98% - The dataset covered nearly all global equity markets at the start of the 20th century. UK share of world capitalization in 1899: 25% - The UK was the largest market at the start of the database. US share of world capitalization in 1899: 15% - The United States was second in the 1899 world market ranking. Germany share of world capitalization in 1899: 13% - Germany ranked third in the global market at the end of 1899. Russia share of world market cap in 1899: 6% - Russia was a significant market before communist rule and later suffered a full wipeout in the dataset. Austria-Hungary weighting in 1899 world index: 5% - Added to address success bias because it was one of the worst-performing markets. Japan peak share of world index: almost 45% - At its peak in early 1990, Japan briefly became the world’s largest market. US share of total world capitalization today: 51% - The US has regained dominance in the global stock market. China, Canada, France, Germany, Switzerland share: about 3% each - These countries each represent roughly 3% of global market capitalization in the book’s figure. Australia share: 2.4% - Australia is shown as a smaller but notable market in the figure. Non-yearbook countries share at 2018: 9.3% - These are countries for which the data does not go back to 1900, mostly emerging markets.

Pivotal Quotes: "The safer option is to hold a globally diversified equity portfolio." — Elroy Dimson: Final investment takeaway after discussing market volatility and country-level uncertainty. "That is the most important lesson we learn from our detailed study of financial market history." — Elroy Dimson: Concluding the argument that history supports diversification over market timing. "The US is by far the world's best documented capital market." — Elroy Dimson: Explains why relying solely on US historical returns can create success bias.

Implications: Investors should be wary of extrapolating from one country’s history, especially the US. Long-run global evidence supports broad diversification and cautions against country picking, market timing, and survivorship-biased assumptions.