Final answer:
The topic not studied in macroeconomics is D) Market for new cars, as macroeconomics deals with the economy as a whole, focusing on aggregate measures like unemployment, inflation, and growth, rather than specific markets.
Step-by-step explanation:
D) Market for new cars. In macroeconomics, we study the behavior of the economy as a whole, rather than the behavior of specific markets or sectors. Macroeconomists focus on aggregate measures of an economy, such as the national unemployment rate, inflation, and economic growth. These areas reflect the overall health of an economy and are influenced by national and international policies and trends.
The market for new cars, however, is considered a part of microeconomics, which is the study of individual markets and sectors within the economy. Microeconomics looks into how individual households and firms make decisions, and how they interact in specific markets. The individual car market -- while it can have macroeconomic implications -- is studied in its own detail, with regard to supply and demand, pricing, competition, and consumer behavior within that market. Therefore, the market for new cars is not typically a subject of macroeconomic study.