If business is now a global affair, then the export-import business is important, lucrative and necessary. An export-import agent is not a broker --- the agents are lower on the business totem pole.
Most properties are measured using a number and a unit of measurement. The unit of measurement is a standard amount. The number compares the property to that standard amount. This means a tree that is ten times as tall as a meter stick is 10 meters tall.
Measurement. an operation by means of which the ratio of one quantity (the quantity being measured) to another quantity of the same kind (taken as a unit) is determined; the number that expresses this ratio is called the numerical value of the quantity being measured.