The Income Formula represents the way to calculate Gross Domestic Product (GDP) by adding up all the incomes earned in an economy, where 'W' stands for wages, 'i' for interest, 'r' for rent, and 'p' for profit. This formula illustrates how income generated from production contributes to the overall economic output. Understanding this formula helps connect the dots between individual earnings and the larger economic picture, showing how different types of income play a role in determining a country's GDP.