Three essays on macroeconomic policy

The thesis consists of three self-contained essays on macroeconomics, steering the focus towards highly-debated, ever-challenging prescriptions in the field of macroprudential and fiscal policy. They are deeply routed in the idea that economic systems feature intrinsic complexity and are conspicuously characterised by the presence of high, persistent uncertainty and systematic coordination failures. In his General Theory Keynes coined the term ``animal spirits", waves of optimism and pessimism, to explain how modern economies have never shown tendency to reach full employment, nor to any sort of general equilibrium. Thus, governments are entitled to stabilize the economic system, and possibly set growth trajectories, by adopting timely appropriate public budget policies; and monetary authorities to ensure that the financial system is stable and resilient, rather than merely focusing on inflation targeting. The thesis attempts to analyze these aspects with different approaches.