The Big Bang: Stock Market Capitalization in the Long Run ?
The Big Bang: Stock Market Capitalization in the Long Run ? Dmitry Kuvshinov and Kaspar Zimmermann † April 2019 Abstract This paper presents new annual long-run stock market capitalization data for 17 advan- ced economies. Going beyond benchmark year estimates 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 ratio of stock market capitalization to GDP was stable between 1870 and 1980, tripled with a “big bang” in the 1980s and 1990s, and remains high to this day. We use novel data on equity returns, prices and cashflows to explore the underlying drivers of this sudden structural shift. Our first key finding is that the big bang is driven almost entirely by rising equity prices, not quantities. Net equity issuance is sizeable but relatively constant over time, and plays very little role in the short and long run dynamics of market cap. Second, this price increase is explained by a mix of higher dividend payments, and a higher valuation – or a lower discount rate – of the underlying dividend stream. Third, high market capitalization forecasts low subsequent equity returns, outperforming standard predictors such as the price-dividend ratio. Our results imply that rather than measuring financial efficiency, stock market capitalization is best used as a “Buffet indicator” of investor risk appetite. Keywords: Stock market capitalization, financial development, financial wealth, equity valuations, risk premiums, return predictability JEL classification codes: E44,G10,N10,N20,O16 ?This work is part of a larger project kindly supported by a research grant from the Bundesministerium fur¨ Bildung und Forschung (BMBF).
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