The financial (in)stability real interest rate, r**

We introduce the concept of a financial stability real interest rate using a macroeconomic banking model with an occasionally binding financing constraint, as in Gertler and Kiyotaki (2010). The financial stability interest rate, r**, is the threshold interest rate that triggers the constraint being binding. Increasing imbalances in the financial sector, measured by an increase in leverage, are accompanied by a lower threshold that could trigger financial instability events. We also construct a theoretical implied financial conditions index and show how it is related to the gap between the natural and financial stability interest rates.