“… See Mateos-Planas and Seccia [2006],Mateos-Planas and Ríos-Rull [2010], andMateos-Planas [2013] on models of credit lines;Chatterjee, Corbae, and Rios-Rull [2008a],Chatterjee, Corbae, and Rıos-Rull [2008b], and Chen [2012] on models of credit scoring; andMitman [2011] andHedlund [2011] for models of long term relationships between borrowers and lenders.2 Our paper also complements studies on optimal UI over the business cycle( Mitman and Rabinovich [2011],Birinci and See [2017], and references therein).…”