This document provides an overview of key macroeconomic concepts including GDP, its components and measurement. It defines GDP as the total value of final goods and services produced, which can be measured through total expenditure or total income. GDP has nominal and real components, with real GDP adjusting for inflation using a base year. Other concepts covered include GNP, the GDP deflator, CPI, stocks and flows. Worked examples are provided to demonstrate calculating GDP and inflation rates. Limitations of CPI in measuring inflation are also discussed.