I revisit the relationship between growth and volatility in two different disaggregated data sets. I confirm that growth and volatility are negatively related across countries, but show that across sectors, the relation is the opposite. This phenomenon, sometimes called "Simpson's fallacy", has...

This paper revisits the relation between growth and volatility in disaggregated data. Across countries, the link is confirmed to be significantly negative, but the paper shows that across sectors, the relation becomes positive. This reversal has a natural interpretation. The macroeconomic...

We use portfolio theory to quantify the efficiency of state-level sectoral patterns of production in the United States. On the basis of observed growth in sectoral value added output, we calculate for each state the efficient frontier for investments in the real economy, the efficient Sharpe...