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Investment (I) is the second-largest component of aggregate demand and plays a crucial role in determining both short-run economic fluctuations and long-run economic growth. Unlike consumption, which is relatively stable, investment is highly volatile — making it a major source of macroeconomic instability. Understanding what drives investment decisions is essential for analysing AD shifts, the multiplier, and economic cycles.
In economics, investment refers specifically to spending on capital goods — assets used in the production of other goods and services:
| Type of Investment | Examples |
|---|---|
| Fixed capital investment | Machinery, factories, offices, transport infrastructure |
| Working capital investment | Stocks of raw materials, work-in-progress, finished goods |
| Residential investment | Construction of new housing |
| Public investment | Government spending on infrastructure — roads, hospitals, schools |
| Intangible investment | Research and development (R&D), software, intellectual property |
Exam Tip: Do not confuse economic investment (spending on capital goods to increase productive capacity) with financial investment (buying shares, bonds, or property as assets). In macroeconomics, "investment" always means capital formation unless stated otherwise.
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