Switching Regimes in Economics: The Contraction Mapping and the ω-Limit Set

This paper considers a dynamical system defined by a set of ordinary auto- nomous differential equations with discontinuous right-hand side. Such sys- tems typically appear in economic modelling where there are two or more re- gimes with a switching between them. Switching between regimes may be a consequence of market forces or deliberately forced in form of policy imple- mentation. Stiefenhofer and Giesl [1] introduce such a model. The purpose of this paper is to show that a metric function defined between two adjacent tra- jectories contracts in forward time leading to exponentially asymptotically stability of (non)smooth periodic orbits. Hence, we define a local contraction function and distribute it over the smooth and nonsmooth parts of the peri- odic orbits. The paper shows exponentially asymptotical stability of a periodic orbit using a contraction property of the distance function between two adja- cent nonsmooth trajectories over the entire periodic orbit. Moreover it is shown that the ω-limit set of the (non)smooth periodic orbit for two adjacent initial conditions is the same.