Add to ORKGThis thesis develops theoretical macroeconomic models that contribute to the policy debate by providing new insights on fiscal-monetary interactions. It is composed of three chapters that emphasise the role of government debt (maturity) in shaping private sector's expectations and in stabilising the macroeconomy. The first chapter studies the importance of coordination between time-consistent fiscal and monetary policy for macroeconomic outcomes during a liquidity trap episode. It shows how central bank independence may imply a negative effect of government debt on consumption when the zero lower bound on interest rates is binding. In this context, long-lasting consolidation of debt turns out optimal to keep inflation below target at positi...