Net income, a crucial metric in business and accounting, measures profitability after subtracting all expenses, taxes, and costs from total revenue. It reflects the remaining earnings available to shareholders or individuals once all obligations have been fulfilled. Scholars such as Wilhelm Roscher examined net income as a division of economic value into rent, wages, and returns on capital, while John Maynard Keynes associated it with overall investment and capital expansion.
Louis Brandeis explored its significance in taxation, emphasizing how different rates apply to various income levels. These viewpoints highlight net income's dual function as both a gauge of financial performance and a key component in economic policy and resource distribution.