Discussions on the connection between the level of interest rates, incentives to search for yield, and financial stability have been prominent over the last ten years or so. More recently, Larry Summers argued in his 2014 secular stagnation address that the decline in the real interest rates would be expected to increase financial instability. This column addresses the challenging issue of providing an explanation for the connection between these phenomena. An increase in the supply of savings that reduces equilibrium real rates can be associated with an increase in the risk of the banking system. This link can explain the emergence of endogenous boom and bust cycles.