Questions: Investment Demand and Capital Formation

Question 1

The interest rate falls from 5% to 3%. How does this most directly affect investment spending?

• A. Investment falls because lower interest rates signal a weak economy with poor profit prospects
• B. Investment rises because the user cost of capital falls, making previously unprofitable projects viable and raising NPV of long-lived projects
• C. Investment is unaffected because firms fund investment from retained earnings, not borrowing
• D. Investment rises only temporarily until firms realize future demand has not actually changed

Answer: (B)

The user cost of capital includes the opportunity cost of deploying funds (the interest rate). A lower rate reduces this opportunity cost, making capital investment relatively more attractive. Additionally, lower discount rates raise the NPV of future cash flows from long-lived investments, turning marginal projects profitable. Option C is wrong — even internally-funded investment uses the interest rate as an opportunity cost (the firm could have put those retained earnings in bonds instead). This user-cost channel is monetary policy's primary transmission mechanism to real investment.

Question 2

A firm is deciding whether to build a factory whose revenues will arrive over 20 years. A credible forecast revises expected demand upward by 10% starting in year 5. How should this most likely affect the investment decision?

• A. It has no effect since the revision affects future years, not current profitability
• B. It increases the NPV of the investment, making it more likely to proceed
• C. It decreases investment because higher future demand means more competition entering later
• D. It only matters if the firm can hedge the revenue stream against interest rate risk

Answer: (B)

Investment is a bet on future cash flows. A revision to expected future demand directly increases the NPV of the investment project — the same capital outlay today now produces a larger expected return stream. This illustrates why investment is 'forward-looking': current conditions matter less than the expected trajectory of future returns. This also explains the Keynesian insight about 'animal spirits' — a shift in expectations about future profitability can dramatically alter investment decisions even without any change in current fundamentals.

Question 3

Because investment is a small share of GDP (roughly 15–20%), it contributes less to business cycle volatility than consumption does.

• T. True
• F. False

Answer: False

Investment's small GDP share means its contribution to GDP levels is smaller than consumption, but volatility is about percentage swings, not levels. Investment can fall 20%+ during recessions while consumption falls only 2–3%. A 20% fall in a 15% GDP share (−3 percentage points of GDP) is a larger contribution to the GDP decline than a 3% fall in a 70% share (−2.1 percentage points). The 2008–2009 data illustrates this: US business fixed investment fell over 20% while consumer spending fell only 3%, yet investment's swings dominated the recession's depth.

Question 4

If firms only cared about current-period profitability rather than expected future returns, investment would be less sensitive to interest rate changes.

• T. True
• F. False

Answer: True

Discounting matters more when cash flows are concentrated in the future. Capital investment yields returns spread over many years; a change in the discount rate (interest rate) has an outsized effect on NPV when future returns are large. If firms only looked at the current period, the interest rate would matter only through current financing costs, not through discounting long future streams. It is precisely the long-run, forward-looking nature of investment that makes it interest-elastic and thus a key channel for monetary policy.

Question 5

Explain why investment is more volatile than consumption over the business cycle, using the concept of expectations.

Model answer: Consumption is largely determined by current income and stable long-run income expectations — households smooth consumption over their lifetimes. Investment decisions, by contrast, require forecasting demand, input costs, competition, and the regulatory environment over 10–20 years. Small revisions to long-run expectations can flip the sign of an investment project's NPV, reversing large capital commitments. A 10% downgrade to expected future returns from a factory can make a previously attractive project unviable, causing investment to collapse even while current production is unchanged. Because expectations are inherently uncertain and can shift rapidly on news, investment is prone to discrete, large swings that consumption is not.

Keynes captured this with 'animal spirits' — investment can be driven by waves of optimism and pessimism not fully tethered to fundamentals. This forward-looking volatility explains why investment crashes sharply in recessions (firms become pessimistic about future demand) and recovers erratically in expansions (firms require sustained evidence before committing to long-lived projects). Rising interest rates during downturns further suppress investment through the user cost and NPV channels, amplifying the cycle.