This thesis deals with 3 important aspects of optimal investment in real-world financial markets: taxes, crashes, and illiquidity. An introductory chapter reviews the portfolio problem in its historical context and motivates the theme of this work: We extend the standard modelling framework to...

This thesis consists of three chapters that analyze the stability of financial institutions. The focus lies on self-fulfilling liquidity crises that are associated with maturity transformation conducted by financial intermediaries such as banks. The first chapter shows that the government has a...