When macroeconomists add together the purchases of houses,cars,food,clothing,entertainment,and other goods and services by households in an economy,they are performing

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Aggregation refers to the process of adding together individual economic variables to form a broader measure, such as Gross Domestic Product (GDP). In this case, macroeconomists are adding together the purchases of different goods and services by households, which is an example of aggregation. The other choices do not accurately describe this process. Normative analysis involves making value judgments about whether a particular economic outcome is desirable or not, whereas positive analysis seeks to explain how the economy works without making value judgments. Macro-economic policy and fiscal policy involve the government's actions to influence the economy, rather than the aggregation of household purchases.

When Macroeconomists Add Together the Purchases of Houses,cars,food,clothing,entertainment,and Other Goods