This dissertation is motivated by the research results of Benigno and Fornaro (2014). Benigno and Fornaro (2014) research, how low interest rates impact the productivity of economies. This dissertation implements extensions of the Benigno and Fornaro (2014) model, that particularly address the capital accumulation, the production functions, and the technology accumulation. In doing so, this dissertation shows that some of the Benigno und Fornaro (2014) research results require specific assumptions, to qualitatively ...