In this article, we derive a solution for a linear stochastic model on a complex time domain. In this type of models, the time domain can be any collection of points along the real number line, so these models are suitable for problems where events do not occur at evenly-spaced time intervals....

Although spectral analysis of stationary stochastic processes has solid mathematical foundations, this is not always so for some non-stationary cases. Here, we establish a rigorous mathematical extension of the classic Fourier spectrum to the case in which there are AR roots in the unit circle,...

The net worth approach to fiscal analysis is cast in a simple model able to capture the dynamics and steady-state equilibria of public sector's debt, nonfinancial and financial assets, and net worth under alternative fiscal rules, including the golden rule and the golden rule cum debt...