The Big Bang: Stock Market Capitalization in the Long Run

Kuvshinov, Dmitry and Zimmermann, Kaspar (2018): The Big Bang: Stock Market Capitalization in the Long Run.

Abstract

This paper presents annual stock market capitalization data for 17 advanced economies from 1870 to today. Extending our knowledge beyond individual benchmark years in the seminal work of Rajan and Zingales (2003) reveals a striking new time series pattern: over the long run, the evolution of stock market size resembles a hockey stick. The stock market cap to GDP ratio was stable for more than a century, then tripled in the 1980s and 1990s and remains high to this day. This trend is common across countries and mirrors increases in other financial and price indicators, but happens at a much faster pace. We term this sudden structural shift “the big bang” and use novel data on equity returns, prices and cashflows to explore its underlying drivers. Our first key finding is that the big bang is driven almost entirely by rising equity prices, rather than quantities. Net equity issuance is sizeable but relatively constant over time, and plays very little role in the short, medium and long run swings in stock market cap. Second, much of this price increase cannot be explained by more favourable fundamentals such as profits and taxes. Rather, it is driven by lower equity risk premia – a factor that is linked to subjective beliefs and can be quite fickle, and easily reversible. Third, consistent with this risk premium view of stock market size, the market cap to GDP ratio is a reliable indicator of booms and busts in the equity market. High stock market capitalization – the “Buffet indicator” – forecasts low subsequent equity returns, and low – rather than high – cashflow growth, outperforming standard predictors such as the dividend-price ratio.

• Item Type: MPRA Paper
• Language: English
• Keywords: Stock market capitalization; financial development; financial wealth; equity issuance; equity valuations; risk premiums; equity bubbles
• Subjects: E - Macroeconomics and Monetary Economics > E4 - Money and Interest Rates > E44 - Financial Markets and the Macroeconomy; G - Financial Economics > G1 - General Financial Markets > G10 - General; G - Financial Economics > G2 - Financial Institutions and Services > G20 - General; N - Economic History > N1 - Macroeconomics and Monetary Economics ; Industrial Structure ; Growth ; Fluctuations > N10 - General, International, or Comparative; N - Economic History > N2 - Financial Markets and Institutions > N20 - General, International, or Comparative; O - Economic Development, Innovation, Technological Change, and Growth > O1 - Economic Development > O16 - Financial Markets ; Saving and Capital Investment ; Corporate Finance and Governance

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