Final answer:
The subject of this question is Macroeconomics and National Income Accounting collects macroeconomic statistics on production, income, investment, and savings.
Step-by-step explanation:
The subject of this question is Macroeconomics which falls under the Social Studies category. Macroeconomics focuses on broad economic issues such as growth, unemployment, inflation, and trade balance. A system that collects macroeconomic statistics on production, income, investment, and savings is called National Income Accounting, which is a part of macroeconomics.