WThis doctoral thesis focuses on the effects of investor sentiment on asset pricing and the challenges of portfolio optimization under parameter uncertainty. The first essay "Sentiment risk premia in the cross-section of global equity" applies a recently developed sentiment proxy to the...

The dissertation focuses on noise traders in financial markets. The first part considers a Rational Expectations equilibrium (REE) model based an Hellwig (1980) and Grossman ans Stiglitz (1980). The aim of this part is to analyze the performance of noise traders by considering expected final...