A vast body of empirical literature documents the existence of short-term momentum and medium-term mean reversion in various financial markets. By contrast, there is still a great shortage of theoretical models that explain the presence of these two common phenomena. We develop a semi-Markov...

In Markowitz portfolio optimization problems, the estimation of the inverse covariance matrix is not trivial and could even be intractable when the dimension is very high. In this article, we propose a linear portfolio optimizer (LPO) to solve Markowitz optimization problems in both...

This work presents the ordered weighted average or OWA portfolio optimization model. This general model allows us to express various classical portfolio optimization models like Gini mean difference, conditional value at risk, weighted conditional value at risk, tail Gini and minimax as...

Markowitz mean-variance portfolios with sample mean and covariance as inputparameters feature numerous issues in practice. They perform poorly out of sampledue to estimation error, they experience extreme weights together with high sensitivityto change in input parameters. The heavy-tail...

In finance, investment decisions are commonly based on Markowitz's ex-ante mean-variance (MV) portfolio problem. The static ex-post trading problem, however, is completely absent. In this paper, we propose a theoretical extension of the MV framework by adding a time dimension so that the...

The paper examines the return and volatility transmission between NFTs, Defi assets, and other assets (oil, gold, Bitcoin, and S&P 500) using the generalized vector autoregressive framework. The results report weak static return and volatility spillovers between NFTs and Defi assets and selected...

Deferred income taxation is widely used to encourage investment or saving. However, most income tax bases are more or less distortive (non-neutral). Using lab experiments, we find that the deferral of a distortive income taxation can result in substantial overproduction and less willingness to...

We develop a portfolio balance model to analyze the impact of euro area quantitative easing (QE) on asset yields. Our model features two countries each populated by two agents representing their respective banking and mututal fund sectors. Agents, which differ in their preferences for assets,...