Occasionally Binding Constraints in Large Models: A Review of Solution Methods Staff Discussion Paper 2021-5 Jonathan Swarbrick Solving macroeconomic models is difficult. One challenge is the occasionally binding constraint of the zero lower bound on nominal interest rates. This paper reviews various ways to solve models that include this feature. Content Type(s): Staff research, Staff discussion papers Topic(s): Business fluctuations and cycles, Economic models JEL Code(s): C, C6