GDP and NDP play a crucial role in economic planning and policy making by providing insights into production levels, income generation, and economic efficiency. GDP helps policymakers identify growth trends, sectoral contributions, and overall economic size, which supports decisions on taxation, public spending, and development priorities. NDP, on the other hand, highlights the net gains after accounting for depreciation, guiding policies focused on sustainable growth and capital maintenance. Together, these indicators assist governments in framing balanced economic strategies, monitoring progress, and ensuring long-term economic stability.