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This answer would be reliability.
The correct answer is plumbing
Answer: to increase interest rates which reduced aggregate demand.
Explanation:
Since the money supply was contracted to reduce the rate of inflation, this will lead to increase interest rates which reduced aggregate demand.
In this case as a result of the increase in the interest rate, people will prefer to save their money in the banks and thus will result in less money in circulation which ultimately reduces the demand for goods and services.
They both could be working together to find out how and when the truck driver would have fallen asleep and what could have caused him to fall asleep. Next, they could both figure out if the ammonia was in sealed containers and if not why. You could even come to the conclusion of the ammonia could have leaked from the containers and exposed the driver putting him to sleep.