This report delves into the intricacies of the global economy, exploring the impact of fiscal policy, specifically tax cuts, on real GDP using the aggregate expenditure model. It evaluates the effects of investment in both the long and short run, illustrating how changes in investment influence aggregate demand and supply, ultimately affecting price levels and real GDP. The report also provides policy recommendations for central banks to stimulate investment, focusing on interest rate adjustments and money supply management. Furthermore, it examines the roles and skills of an accountant, aligning them with the author's aspirations to work in a banking institution, and includes an interpretation of a video discussing career paths for economists, followed by a detailed action plan for professional development. The analysis incorporates relevant economic theories and models to provide a comprehensive understanding of the topics discussed.