CFA Level I Exam · Understanding Business Cycles

Resource Use and Economic Activity Across the Business Cycle

Updated 7 October 2026 · Fact-checked

Resource use across the cycle describes how firms adjust inventories, labor, capital spending and housing activity as demand changes. Firms adjust inventories first, then hours worked, then headcount, and delay big capital spending until demand looks durable. To solve questions, identify the phase, then apply the usual sequence of adjustments.

Understand Resource Use and Economic Activity Across the Cycle

A business cycle moves through expansion, peak, contraction and trough. Firms cannot see demand ahead of time, so they adjust resources in a set order. They use the cheapest and most reversible tools first and the costly ones last.

Inventories. Firms hold inventory to meet expected sales. The inventory-sales ratio (inventory ÷ sales) shows how much stock sits against current demand. Late in an expansion, firms build stock expecting more sales. If sales then fall short of expectations, unplanned stock builds and the ratio rises. This is common in late expansion and early contraction. Firms then cut orders and production to work stock down, which pushes the economy deeper into contraction. The ratio is typically high near the trough, because sales have fallen while firms are still working off stock. As destocking proceeds, the ratio falls and stock becomes lean. By early expansion, stock is lean, so production must rise just to meet sales, which helps start recovery. In early expansion, sales rise faster than inventory, so the ratio falls to low levels.

Labor. Hiring and firing are costly, so firms change hours first. In a slowdown they cut overtime and part-time hours, then may use temporary workers, and only then lay off permanent staff. In a recovery they do the reverse: raise hours and use temporary staff first, then hire permanent workers once demand looks lasting. So employment is a lagging indicator, while average hours worked tend to lead. Productivity (output per hour) usually rises in early expansion because existing workers produce more before firms add staff.

Capital spending. Firms invest in plant and equipment when they expect lasting demand. Capacity utilization is high late in an expansion, which pushes firms to spend. In a contraction, spare capacity makes new spending unnecessary, so capital spending falls and stays low until utilization recovers. Capital spending takes time to plan and build, so it generally responds late, but its timing varies from cycle to cycle.

Housing. Housing is interest-rate sensitive and is often a leading sector. Falling rates and rising incomes lift demand for homes, and housing activity typically recovers before the wider economy. Rising rates, tighter credit and falling affordability can cool housing before a peak. Housing also affects spending through household wealth and construction employment. Housing cycles can last longer than the overall cycle, and local factors such as supply, demographics and credit conditions can matter.

Key formulas to remember

Inventory-sales ratio: Inventory-sales ratio = Inventory ÷ Sales; Use the same period basis for both. A rising ratio late in an expansion or in a slowdown signals unplanned stock; a falling ratio in early recovery signals lean stock.
Typical labor adjustment order (slowdown): Cut overtime/hours → temporary workers → permanent layoffs; Recovery runs the other way: hours first, then temporary staff, then permanent hiring.
Capacity utilization: Capacity utilization = Actual output ÷ Potential output; High readings late in expansion encourage capital spending; low readings in contraction suppress it.

How to solve Resource Use and Economic Activity Across the Cycle questions

Use this sequence for any question on how resources behave through the cycle.

1Find the phase described: early expansion, late expansion, peak, contraction or trough.
2Name the resource asked about: inventories, labor, capital spending or housing.
3Recall the usual behavior in that phase, using the cheapest, most reversible adjustment first.
4For inventories, compare sales growth with inventory growth to judge the direction of the inventory-sales ratio.
5For labor, ask whether the firm would change hours, temporary staff or permanent headcount at this stage.
6Decide whether the variable tends to lead or lag (housing and hours tend to lead; employment tends to lag; capital spending generally responds late because projects take time to plan, but its timing varies).
7Eliminate the two options that reverse the sequence or ignore costs of adjustment, then pick the one that fits.

Quickest way: Phase and cost-of-adjustment shortcut

When to use it: Use this for conceptual three-option questions with no calculation.

Ask: is demand rising or falling, and is it a surprise?
Unexpected weak sales means stock builds and the inventory-sales ratio rises.
Cheap and reversible actions (hours, inventory orders) come first; costly ones (layoffs, plants) come last.
Housing and hours tend to lead; employment tends to lag; capital spending generally responds late, but timing varies.
Eliminate any option that has firms making the costly move first.

Common mistakes in Resource Use and Economic Activity Across the Cycle

Saying a rising inventory-sales ratio is always good because firms are stocking up.
Students read higher inventory as preparation for growth.
Fix: Check why it rose. If sales fall short of expectations, the build is unplanned and signals a coming production cut. Planned building in early expansion is different.
Thinking firms lay off permanent workers first in a downturn.
Layoffs are the most visible sign of a recession.
Fix: Remember the order: hours and overtime, then temporary staff, then permanent layoffs. Layoffs come after a persistent drop in demand.
Calling employment a leading indicator.
Jobs seem to drive the economy.
Fix: Firms are slow to hire and fire, so employment lags the cycle. Average hours worked tend to move earlier.
Assuming capital spending rises at the start of a recovery.
Students link recovery with investment.
Fix: Spare capacity at the trough means firms delay new plant spending until utilization is high and demand looks durable.
Treating housing as moving with or after the economy.
Housing is seen as a consumer-spending outcome.
Fix: Housing is rate sensitive and is often a leading sector, but timing varies with credit conditions and local factors.

Worked examples

Example 1

A manufacturer's sales growth slows sharply in the late stage of an expansion, while its inventories keep rising on earlier production plans. Which is the most likely outcome? A) The inventory-sales ratio falls and the firm raises production. B) The inventory-sales ratio rises and the firm cuts production. C) The inventory-sales ratio is unchanged and the firm hires permanent staff.

Show the solution

Inventory grows while sales growth slows, so inventory ÷ sales rises.
Rising unplanned stock means the firm has too much inventory for demand.
The firm responds by cutting orders and production to work stock down.
Option A reverses the ratio direction; option C ignores the stock build and uses the costly labor move.

Answer: B

Example 2

A firm is emerging from a trough with rising orders that it is not yet sure will last. Which labor response is most likely first? A) Lay off temporary workers. B) Hire permanent staff. C) Raise hours and overtime for existing workers.

Show the solution

Early in a recovery, demand is uncertain.
Hiring permanent staff is costly to reverse, so it comes later.
Raising hours and overtime is cheap and reversible, so it comes first.
Laying off temporary workers fits a slowdown, not a recovery.

Answer: C

Exam tips

Questions are usually conceptual three-option items; focus on the order of adjustment and the phase.
Learn which variables tend to lead (housing, average hours) and which tend to lag (employment). Capital spending generally responds late, but do not treat it as a fixed lagging indicator.
For the inventory-sales ratio, think about whether the stock build was planned and what it signals next.
Eliminate options where the costly, hard-to-reverse action comes before the cheap one.
There is no penalty for wrong answers, so always pick an option.

Practice questions from Understanding Business Cycles

Resource Use and Economic Activity Across the Cycle: frequently asked questions

What does the inventory-sales ratio tell you about the business cycle?

It compares stock held with current sales. A rising ratio late in an expansion signals unplanned stock and likely production cuts. A falling ratio in early recovery signals lean stock and rising production.

How do firms adjust labor during the business cycle?

They change hours and overtime first, then use temporary workers, and only later change permanent headcount. This is because hiring and firing are costly. It is why employment lags the cycle.

Is the housing sector a leading indicator?

Housing is rate sensitive and is often a leading sector, turning before the broader economy in many cycles. The timing varies with credit conditions, local supply and demographics.

Why does capital spending generally respond late in the cycle?

Firms invest only when they expect lasting demand and when spare capacity is used up. Projects also take time to plan and build, so spending generally responds late. Timing varies between cycles, and investment can be volatile.