This study examines the market efciency in the prices and volumes of transactions of 41 cryptocurrencies. Specifcally, the correlation dimension (CD), Lyapunov Exponent (LE), and approximate entropy (AE) were estimated before and during the COVID-19 pandemic. Then, we applied Student's t-test...

We propose a simple agent-based version of Paul de Grauwe's chaotic exchange rate model. In particular, we assume that each speculator follows his own technical and fundamental trading rule. Moreover, a speculator's choice between these two trading philosophies depends on his individual...

We develop a nonlinear duopoly model in which the heuristic expectation formation and learning behavior of two boundedly rational firms may engender complex dynamics. Most importantly, we assume that the firms employ different forecasting models to predict the behavior of their opponent....

A.A. Walters developed a traffic theory that is still adopted by many countries to solve congestion. To justify his theory, he claimed that it reflects the supply and demand of traffic. This paper shows that his supply-demand model is unstable and disastrous