Which of the following is NOT one of the three categories of investment?

The correct choice identifies infrastructure investment as not falling within the three primary categories of investment commonly recognized in economic analysis. The three main categories are business fixed investment, residential fixed investment, and changes in inventories.

Business fixed investment refers to spending by businesses on physical assets such as equipment and structures that will be used for production. Residential fixed investment represents expenditures on residential housing, including new homes and renovations. Changes in inventories capture the investments made by businesses to increase or decrease the stock of unsold goods.

Infrastructure investment, while crucial for long-term economic growth and public welfare, typically does not fall within these standard classification categories of investment for GDP calculation purposes. Instead, it is often categorized separately as part of public spending or government investment rather than as a classification of private investment. Understanding these distinctions is important in grasping how different types of investment impact economic metrics and overall economic activity.