1. A Recipe for Measuring Economic Recessions in Bronze Age China
2. Calculate the mutual information between industrial output (fred.stlouisfed.org/series/IPFPNSS) and the interest rate spread (fred.stlouisfed.org/categories/33446). Find out what rules-based filtering results in higher correlations (e.g. specific time periods, maybe based on the volatility / threshold of a 3rd variable)