Passage Summary: When the weather ruins the wheat harvest, it triggers a financial domino effect that hurts everyone from the seed sellers to the diesel mechanics.

Reasoning: Uncontrollable factors causing wheat crop failure lead to business losses for dealers, truckers, and mechanics, and a lack of profit for fuel suppliers.

Analysis: This stimulus sets up a conditional relationship: if uncontrollable crop failure happens, then a specific set of economic consequences follows. In 'Must be True' questions, we treat these premises as absolute law. We should look for an answer that either applies this rule directly or uses the contrapositive—for instance, if fuel suppliers *are* making a profit, then we can conclude the wheat crops did not fail due to those uncontrollable factors.