Causation

Inverse Relationship Between Interest Rates and Investment

A rise in the market interest rate (rr), which can be triggered by an increase in the central bank's policy rate that raises the real interest rate, will cause aggregate investment to fall, assuming other factors like expected future profits remain constant (ceteris paribus). As explained by the present value model, a higher interest rate increases firms' discount rates, reducing the present value of expected profits and the net present value (NPV) of potential projects. Consequently, with fewer projects meeting the investment criteria, total investment spending decreases. This causal link is a key part of the monetary policy transmission mechanism.

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Updated 2026-05-02

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