Empirical evidence suggests that investments in research and development (R&D) by older and larger firms are more spread out internationally than R&D investments by younger and smaller firms. In this paper, I explore the quantitative implications of this type of heterogeneity by assuming that...

The goal of this paper is to present an original and simple analysis aimed to understand why investing in capital markets can be very dangerous for "naive investors". Stock markets display often exploding volatility. They are characterized by instability and subject to external shocks. If...

The goal of this paper is to present an original and simple analysis aimed to understand why investing in capital markets can be very dangerous for "naive investors". Stock markets display often exploding volatility. They are characterized by instability and subject to external shocks. If...