which cost is used as barometer of efficiency as it is compared with actual cost
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is mercury the answer?
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A stock market index serves as a barometer of market activity.
Explanation:
In the same way that a barometer measures atmospheric pressure, index numbers may be used to gauge the impact of economic and corporate behavior on a country's economy. This is why they are referred to as economic barometers.
The aneroid and mercury barometers are the two most common types of barometers. A barometer, by definition, is a device that measures atmospheric pressure in order to forecast weather. A barometer is a device that measures air pressure and displays it.
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