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.
Deciding by observation the amount of a given property a subject possesses is called measurement. In a more liberal sense, the term measurement often refers to any instance of systematic observation in a scientific context. Measurement is always an empirical procedure, such as reckoning the mass of an object by weighing it, or evaluating the amount a student has learned by giving an examination.