Smooth-transition autoregressive (STAR) models, competitors of Markov-switching models, are limited by an assumed time-invariant threshold level. We augment the STAR model with a time-varying threshold that can be interpreted as a 'tipping level' where the mean and dynamics of the VAR shift....

The economics literature lacks articles that provide a broad roadmap-let alone a logical explanation-of the new set of Federal Reserve policy tools that were created to counter the COVID-19 recession. This study provides an overview of the motivation for these new credit-easing programs-namely...