Manipulating Correlations Through Latent Drivers

May 25, 2010

The analysis of a possible positive relationship between economic growth and stock market returns is interesting both theoretically and practically. Investors often wonder if they should assign higher weight to countries with higher economic performance, hoping that economic growth will eventually show up in equity returns. Although this relationship seems quite intuitive, historically long-run stock price growth has fallen short of GDP growth in many countries. In this bulletin, we use long-term equity data to analyze the steps leading from GDP to stock prices, and point out several factors that could explain why GDP growth is diluted before it can reach shareholders.