Determination of Income and Employment | Class 12 Economics Notes

Introduction to Determination of Income and Employment

Macroeconomics seeks to develop theoretical models that explain how key economic variables such as national income, price level, and interest rate are determined. Unlike ad hoc discussions, these models provide a systematic explanation of economic phenomena like periods of slow growth, recessions, inflation, and unemployment. Since it is difficult to analyze all variables simultaneously, the assumption of ceteris paribus (other things remaining equal) is used to isolate the effect of one variable by holding others constant. This approach is analogous to solving simultaneous equations by expressing one variable in terms of another and substituting it back. The chapter focuses on determining national income under the assumptions of fixed price levels and constant interest rates, based on Keynesian theory. This sets the foundation for understanding how aggregate demand and supply interact to determine income and employment in the short run.

📊 Diagram: Reprint 2026-27

🧪 Activity: No specific activity in this introductory section.

🔗 Connection: Leads to the detailed analysis of aggregate demand and its components in the next section.