The thesis consists of two essays: "The CAPM -- A General Equilibrium Foundation" and "The Foreign Exchange Rate in Financial Markets".The Capital Asset Pricing Model (CAPM) is one of the most successful models for portfolio selection. The utility functions are assumed to depend positively on...

This article analyses whether the representation of asset prices by Choquet integration can be justified from a general equilibrium point of view. We demonstrate that if transaction costs functionals are increasing in the volume of trade, positive homogeneous and satisfy an additivity condition,...