Question 4
(D) an increase in the cost per unit of output
Understanding the Logic: Cause vs. Effect
This is an EXCEPT question ("LEAST supports"), meaning four options are factors that cause throughput to drop, while the correct answer does not cause throughput to drop.
The passage sets up a strict Cause -> Effect relationship:
CAUSES (Operational/Logistical Problems):
Issues on the factory floor, bad machinery, poor sales networks, or supplier/wholesaler mismatches.
RESULT:
Throughput drops (production flow slows down).
CONSEQUENCE OF DROPPING THROUGHPUT:
Unit costs rise sharply ("If throughput falls below a critical point, unit costs rise sharply...").
Option (D) reverses this cause-and-effect relationship. An increase in the cost per unit of output is the result of low throughput, not the cause that lowers throughput.
Option-by-Option Breakdown
(A) a mistake in judgment regarding the selection of a wholesaler
Explanation: Incorrect (It does affect throughput). The text explicitly notes that throughput requires coordination of the "flow of output to wholesalers." A poor wholesaler choice disrupts output flow.
(B) a breakdown in the factory's machinery
Explanation: Incorrect (It does affect throughput). The text mentions that production declines due to "problems on the factory floor." Broken machinery is a classic factory-floor problem that halts material flow.
(C) a labor dispute on the factory floor
Explanation: Incorrect (It does affect throughput). A labor dispute is another direct example of "problems on the factory floor" that stops workers and reduces throughput.
(D) an increase in the cost per unit of output
Explanation: Correct. Higher unit cost is the outcome of low throughput, not a factor that causes throughput to decline.
(E) a drop in the efficiency of the sales network
Explanation: Incorrect (It does affect throughput). The text specifically lists "inefficient sales networks" as a primary reason why production and throughput decline.