One reason a common measuring system is important relates to Importing and Exporting goods. A commodity may be sold at $10 per unit, so the size of the unit must be equal in both countries. Another area that a common measuring system would be important is in medicine. The system used to measure doses of a medicine must be universally equal, because the medicine may be used by someone in a country other than where it was manufactured.
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It reduces confusion.
The metric system is an international decimalised system of measurement, first adopted by France in 1791, that is the common system of measuring units used by most of the world.
It is a converter to the metric system, an international decimalised system of measurement, that is the common system of measuring units used by most of the world. Scroll down to related links and look at "Countries where the metric system is official are shown in green".
The Metric System
We have to communicate with other people so we need to use the same system, in all the world the most common is the metric system. Americans like to use their system (for example, they use feet, inches..), it's not the best way to communicate with others! UK is predominantly metric in weight and volumes but still will uses imperial for distance /measuring now but may still used So it is necessary to use the same system, I have already said the best one (most common hence useful) is the metric system.